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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 I’ve 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 .5” 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 I’m noticing it’s closer to 20psi hot idle but goes to 40psi instantly (vs 78/75 running .125” oil feed plate) and gets higher depending on how hard I’m on it. I know it’s 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? It’s 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. Didn’t think I would have to do that with the GM HV pump. |
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. |
Originally Posted by customblackbird
(Post 19947889)
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 I’ve 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 .5” 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 I’m noticing it’s closer to 20psi hot idle but goes to 40psi instantly (vs 78/75 running .125” oil feed plate) and gets higher depending on how hard I’m on it. I know it’s 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? It’s 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. Didn’t think I would have to do that with the GM HV pump. |
Originally Posted by jimmyg
(Post 19947909)
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. |
Originally Posted by Game ova
(Post 19947976)
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. |
my 4.8 runs 30 psi HOT With 20-50. 40 psi cold. SEND IT |
15-40 Delo ftw here, get it on sale at Costco for cheap lol. I was beating the cars ass 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. |
Originally Posted by customblackbird
(Post 19948092)
Dropping 1/2 or more of the pressure is normal? |
Originally Posted by Game ova
(Post 19948138)
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. https://cimg7.ibsrv.net/gimg/ls1tech...8a51342d21.jpg 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. |
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! |
Originally Posted by The BallSS
(Post 19948145)
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. |
Rotella 15w40 FTW.....but I have been considering the Delo stuff after that comparo came out with the highest zinc/phosphorus content oils. |
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. |
Originally Posted by The BallSS
(Post 19948136)
15-40 Delo ftw here, get it on sale at Costco for cheap lol. I was beating the cars ass 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. |
Originally Posted by forcd ind
(Post 19948250)
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. |
Originally Posted by ddnspider
(Post 19948238)
Rotella 15w40 FTW.....but I have been considering the Delo stuff after that comparo came out with the highest zinc/phosphorus content oils. https://cimg0.ibsrv.net/gimg/ls1tech...01df3b1797.jpg
Originally Posted by forcd ind
(Post 19948250)
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. |
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 :punch: |
Originally Posted by Game ova
(Post 19948263)
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 truckdoug
(Post 19948288)
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 :punch: |
Originally Posted by ddnspider
(Post 19948312)
What is this winter you speak of???? :gtfo: :cheers: |
November is just about when we're catching a break and getting nice weather! |
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