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Carquest 20w50 oil in a 150k+ Turbo 5.3? To bump psi?

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Carquest 20w50 oil in a 150k+ Turbo 5.3? To bump psi?

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Old 08-12-2018, 09:03 PM
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Default Carquest 20w50 oil in a 150k+ Turbo 5.3? To bump psi?

been rocking 5w30 in my turbo 5.3 for 2 years (same oil and purolator filter) car only gets driven in hot summer weather and I let it warm up to 140-150 ECT before driving. Engine is a 99 5.3 with 150k+ miles and has been boosted since Iíve had it (3years,centri and now turbo). All original motor with centri made 20psi hot idle on 5w30, opened motor for cam, ported head swap and valve train upgrade and swapped in the GM HV oil pump (found out later it was a LS6 pump with a larger .5Ē exit port). Same 5w30 oil and Engine only makes 20-25psi hot idle with oil temps in the 190-210 range. Since the turbo (this year) Engine is running hotter and oil too so Iím noticing itís closer to 20psi hot idle but goes to 40psi instantly (vs 78/75 running .125Ē oil feed plate) and gets higher depending on how hard Iím on it. I know itís not bad but the 20psi at idle hot drives me crazy. It idles at 35-40psi cold.

Today i decided its its time for an oil change and went to the local store to get some VR1 or a decent oil in a thicker 15w40 or 20w50 since my motor is pretty worn and its only driven when hot outside so no worries about cold starts etc. my local store had no VR1 or anything synthetic in anything higher than 10w30 WTF. My only choices were Castro GTX in 20w50 or Car Quest 20w50 and I decided on Car Quest for $21 for filter and oil change special. Came home and drained the 5w30 and swapped in 6qts of 20w50. Started it up and boom 45psi cold idle (90*F outside), 2k Rpms 55psi, 3k Rpms 70psi. I let it run for a few min before giving it gas as I checked for leaks.

So my question is, carquest oil any good? Itís conventional as I barely put any miles on the car (less than 1k a year). Gona cause any issues with the turbo? Car is only street driven but I beat on her good. Also why is my oil pressure so low for the GM HV pump? I have a spare 03 5.3 with the original pump and it makes 40+psi at idle cold as well even tho I added a nut in the pump relief spring. Didnít think I would have to do that with the GM HV pump.
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Old 08-12-2018, 09:23 PM
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My ly6 has the original pump in it . Same deal 25 lbs hot idle. I have tried 20/50 etc. best oil I found was Mobil 1 0w40. Walmart $25 Bumps it up a little , but not too thick. You should be using synthetic. It takes the heat a lot better and won't thin out as much.
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Old 08-12-2018, 11:46 PM
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Originally Posted by customblackbird View Post
been rocking 5w30 in my turbo 5.3 for 2 years (same oil and purolator filter) car only gets driven in hot summer weather and I let it warm up to 140-150 ECT before driving. Engine is a 99 5.3 with 150k+ miles and has been boosted since Iíve had it (3years,centri and now turbo). All original motor with centri made 20psi hot idle on 5w30, opened motor for cam, ported head swap and valve train upgrade and swapped in the GM HV oil pump (found out later it was a LS6 pump with a larger .5Ē exit port). Same 5w30 oil and Engine only makes 20-25psi hot idle with oil temps in the 190-210 range. Since the turbo (this year) Engine is running hotter and oil too so Iím noticing itís closer to 20psi hot idle but goes to 40psi instantly (vs 78/75 running .125Ē oil feed plate) and gets higher depending on how hard Iím on it. I know itís not bad but the 20psi at idle hot drives me crazy. It idles at 35-40psi cold.

Today i decided its its time for an oil change and went to the local store to get some VR1 or a decent oil in a thicker 15w40 or 20w50 since my motor is pretty worn and its only driven when hot outside so no worries about cold starts etc. my local store had no VR1 or anything synthetic in anything higher than 10w30 WTF. My only choices were Castro GTX in 20w50 or Car Quest 20w50 and I decided on Car Quest for $21 for filter and oil change special. Came home and drained the 5w30 and swapped in 6qts of 20w50. Started it up and boom 45psi cold idle (90*F outside), 2k Rpms 55psi, 3k Rpms 70psi. I let it run for a few min before giving it gas as I checked for leaks.

So my question is, carquest oil any good? Itís conventional as I barely put any miles on the car (less than 1k a year). Gona cause any issues with the turbo? Car is only street driven but I beat on her good. Also why is my oil pressure so low for the GM HV pump? I have a spare 03 5.3 with the original pump and it makes 40+psi at idle cold as well even tho I added a nut in the pump relief spring. Didnít think I would have to do that with the GM HV pump.
Your oil pressure is fine. HV 296 here, and with rotella 15w40 I see about 50 psi cold, and when really hot I see 20-22psi hot. You have nothing to worry about, its when there's no rise....or a drastic change from the norm is where there may be an issue.
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Old 08-13-2018, 09:07 AM
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Originally Posted by jimmyg View Post
My ly6 has the original pump in it . Same deal 25 lbs hot idle. I have tried 20/50 etc. best oil I found was Mobil 1 0w40. Walmart $25 Bumps it up a little , but not too thick. You should be using synthetic. It takes the heat a lot better and won't thin out as much.
I would normally agree... but I literally put 1,646 miles on the car in 5+ years lol. Id be throwing barely used synthetic in the trash if I changed the oil once a year or even once every 2 years. Id rather change the oil more frequently. But I agree that synthetic would be better for the heat of the turbo. Literally didn't have anything in that weight tho in synthetic at the store.
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Old 08-13-2018, 09:08 AM
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Originally Posted by Game ova View Post
Your oil pressure is fine. HV 296 here, and with rotella 15w40 I see about 50 psi cold, and when really hot I see 20-22psi hot. You have nothing to worry about, its when there's no rise....or a drastic change from the norm is where there may be an issue.
Dropping 1/2 or more of the pressure is normal?
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Old 08-13-2018, 09:36 AM
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my 4.8 runs 30 psi HOT With 20-50. 40 psi cold. SEND IT
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Old 08-13-2018, 10:10 AM
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15-40 Delo ftw here, get it on sale at Costco for cheap lol.
I was beating the cars *** at the strip all day yesterday and my oil pressure stayed around 30 psi with my oil cooler fan running on a stock pump and SBE ls1.
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Old 08-13-2018, 10:13 AM
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Originally Posted by customblackbird View Post
Dropping 1/2 or more of the pressure is normal?
Yes, depending on how loose a motor is, combine that with running the oil through a heater AKA turbo, it thins out. But really, oil pressure is a bit overrated, doesn't take much to keep a motor alive. When I bought my car, it had trash oil pressure, to the point that the check gauges light would come on sometimes when leaving a light (my at the time). I decided to pull the motor down, as I thought it was hurt, being that it would idle around 10ish psi when really hot (ended up being a cut oil pump o ring). These are the worst rod bearings on the right, and all the mains looked absolutely perfect, and the majority of the rod bearings looked fresh out the box, uninstalled. The point of all this is, 20psi is more than plenty at idle. WOT hot, I see around 60psi.... runs like a champ.
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Old 08-13-2018, 10:27 AM
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Originally Posted by Game ova View Post
Yes, depending on how loose a motor is, combine that with running the oil through a heater AKA turbo, it thins out. But really, oil pressure is a bit overrated, doesn't take much to keep a motor alive. When I bought my car, it had trash oil pressure, to the point that the check gauges light would come on sometimes when leaving a light (my at the time). I decided to pull the motor down, as I thought it was hurt, being that it would idle around 10ish psi when really hot (ended up being a cut oil pump o ring). These are the worst rod bearings on the right, and all the mains looked absolutely perfect, and the majority of the rod bearings looked fresh out the box, uninstalled. The point of all this is, 20psi is more than plenty at idle. WOT hot, I see around 60psi.... runs like a champ.
Thats where I'm at, I see a little over 60 psi at WOT at 6,500 rpm.
Guys with 20-50 and 100 plus psi oil pressure never made sense to me but then again there a lot of things that don't make sense to me lol.
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Old 08-13-2018, 11:44 AM
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I dont think i would run the carqeust brand oil. Ive personnaly changed oil in cars with it and its some pretty thin oil. Always looks as thin as water. I would have chose the castrol GTX over the carquest!
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Old 08-13-2018, 11:52 AM
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Originally Posted by The ****** View Post
Thats where I'm at, I see a little over 60 psi at WOT at 6,500 rpm.
Guys with 20-50 and 100 plus psi oil pressure never made sense to me but then again there a lot of things that don't make sense to me lol.
There are many around here that wear it like a badge of honor, "my motor makes 85psi at 1000 RPM hot". I just laugh and shake my head, all that pressure isn't helping anything....it can actually hurt you.
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Old 08-13-2018, 12:46 PM
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Rotella 15w40 FTW.....but I have been considering the Delo stuff after that comparo came out with the highest zinc/phosphorus content oils.
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Old 08-13-2018, 01:02 PM
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Curious if you have tried a diff filter, like a K & N or NAPA-I use plain old NAPA 10-30
in the car, and add a little STP (after break in) I feel it adds a little protection.
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Old 08-13-2018, 01:14 PM
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Originally Posted by The ****** View Post
15-40 Delo ftw here, get it on sale at Costco for cheap lol.
I was beating the cars *** at the strip all day yesterday and my oil pressure stayed around 30 psi with my oil cooler fan running on a stock pump and SBE ls1.
I gotta see if my costco sells it... they only usually carry a case of mobil 1 syn.
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Old 08-13-2018, 01:20 PM
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Originally Posted by forcd ind View Post
Curious if you have tried a diff filter, like a K & N or NAPA-I use plain old NAPA 10-30
in the car, and add a little STP (after break in) I feel it adds a little protection.
Ive cut them all open, STP, FRAM, Purlator (regular, pure1 a& boss), K&N, Mobile 1, Mopar, Ford, Acdelco and Bosch. Fram was the worst and STP is slightly better but only good for clean out flushes or break in. All the others are all basically the same (purolator, K&N, mobil 1, bosch) with simular internals and filter media. I personally like the construction and filtration of the purolators and thats why I rock them... they are built like tanks, 99% filtration synthetic media, silicone valves... same as the 3-4x cost mobile/K&N/RP. The purolators are easier to get and usually included with filter changes as well. I run the Purolator BOSS on my Ram hemi and I push that thing 8-10k miles with pure synthetic. I looked at a zinc additive but it was $10 and $19 and decided against it.... also alot of guys dont know that additives dont mix well with synthetic oils... dyno oils are a different story.
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Old 08-13-2018, 01:23 PM
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Originally Posted by ddnspider View Post
Rotella 15w40 FTW.....but I have been considering the Delo stuff after that comparo came out with the highest zinc/phosphorus content oils.
I like rotella 15w40......in the summer. But I like to switch to Mobil 5w30 in the winter, gets really cold where I live. Been driving the car today, it's 87 degrees....rolling with the AC on, and this is what I have for oil pressure.



Originally Posted by forcd ind View Post
Curious if you have tried a diff filter, like a K & N or NAPA-I use plain old NAPA 10-30
in the car, and add a little STP (after break in) I feel it adds a little protection.
I understand that there are differences in opinion here in the gofast community, but all that extra stuff/additives is like snake oil imo. Straight oil has never let me down.
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Old 08-13-2018, 02:18 PM
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hey its been like 6 months since we argued about oil. thats gotta be some sort of record!


5w30 mobile 1 and wix filters or you're doing it wrong

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Old 08-13-2018, 03:00 PM
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Originally Posted by Game ova View Post
I like rotella 15w40......in the summer. But I like to switch to Mobil 5w30 in the winter, gets really cold where I live. Been driving the car today, it's 87 degrees....rolling with the AC on, and this is what I have for oil pressure.
......
What is this winter you speak of????

Originally Posted by truckdoug View Post
hey its been like 6 months since we argued about oil. thats gotta be some sort of record!


5w30 mobile 1 and wix filters or you're doing it wrong

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Old 08-13-2018, 03:13 PM
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Originally Posted by ddnspider View Post
What is this winter you speak of????


Gets down to at least -10 a few times every winter. A few years ago, we hit -25. We don't get to enjoy track weather year round like the Floridians, track closes in November here .
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Old 08-13-2018, 03:37 PM
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November is just about when we're catching a break and getting nice weather!
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