Thicker oil in ls1
08-03-2012, 05:35 PM
#1
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Thicker oil in ls1 I have a 2000 year ls1 car and I was putting 10w30 before. Because of the high mileage I decided to put 20w50. Now I am noticing is when I am accelerating there is a deep noises like brrrrrr coming from engine and also when idling. Before it was whisper quiet. Should I put 10w30 back in it again?
08-03-2012, 05:42 PM
#2
idk about putting thicker oil in for a high mileage car, never heard of that but hey i dont know everything.
what i do know is general rule of thumb is colder enviroments id use the 10. down here in flordia i use the 5w30. if you are in a colder place right now that oil may be too thick for your pump.
what i do know is general rule of thumb is colder enviroments id use the 10. down here in flordia i use the 5w30. if you are in a colder place right now that oil may be too thick for your pump.
08-04-2012, 08:04 AM
#7
I have a 2000 year ls1 car and I was putting 10w30 before. Because of the high mileage I decided to put 20w50. Now I am noticing is when I am accelerating there is a deep noises like brrrrrr coming from engine and also when idling. Before it was whisper quiet. Should I put 10w30 back in it again?
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08-04-2012, 08:33 AM
#9
Thinner is better (for the most part). People think that going to a thicker oil gives you better lubrication and for the most part it does the complete opposite. Thick oil does not flow. Engines use pumps to lubricate (the oil has to flow) - so generally a thinner oil is better because it flows at a higher rate and produces more cooling (which is the main point of oil besides corrosion protection).
Good site to look into if trying to understand oil better:
bobistheoilguy.com
Good site to look into if trying to understand oil better:
bobistheoilguy.com
08-04-2012, 08:57 AM
#10
what i do know is general rule of thumb is colder enviroments id use the 10. down here in flordia i use the 5w30. if you are in a colder place right now that oil may be too thick for your pump.
If the kid is anywhere near cold weather, that **** ain't gonna flow at all when it's below freezing out.
08-04-2012, 09:32 AM
#11
In cold environments yes 5w-30 is better than 10w-30 BUT that does NOT mean that in warmer weather 10w-30 is better. It is entirely possible to have a 10w-30 that is thinner than 5w-30 at operating temps. I have not looked at current analysis but at one time in the M1 lineup their 0w-30 was the THICKEST and the 10w-30 the thinnest with the 5w-30 falling in the middle of the other two.
the 30weight part is a RANGE not a precise measurement, some oils will be thicker and some thinner despite the "same" 5w-30 or whatever on the bottle.
08-04-2012, 09:48 AM
#12
i dont think high milage should change your oil that drasticly, meaning you changed the oil in drastic measure because of milage, im at 165,000 and still use stock weight oil, never had a problem and runs smooth at idle, and like a scalded dog at wot, never a peep from lifters or valvetrain, or any slap. id stick with oem
08-04-2012, 11:56 AM
#14
In cold environments yes 5w-30 is better than 10w-30 BUT that does NOT mean that in warmer weather 10w-30 is better. It is entirely possible to have a 10w-30 that is thinner than 5w-30 at operating temps. I have not looked at current analysis but at one time in the M1 lineup their 0w-30 was the THICKEST and the 10w-30 the thinnest with the 5w-30 falling in the middle of the other two.
the 30weight part is a RANGE not a precise measurement, some oils will be thicker and some thinner despite the "same" 5w-30 or whatever on the bottle.
the 30weight part is a RANGE not a precise measurement, some oils will be thicker and some thinner despite the "same" 5w-30 or whatever on the bottle.
Mobil1 Viscosity Index for 0W-30, 5W-30, and 10W-30 is 166, 172, and 146 respectively.
These values and relationships change from time to time and other brands show different relative viscosities.
08-04-2012, 12:23 PM
#15
So M1 10w-30 is still pretty darn near 10w-20 but the VAST majority still believe it is thicker than 5w-30.
I went over to BITOG and searched a little but their search feature is so bad. Great forum just the search function pulls up way too much useless info.
I went over to BITOG and searched a little but their search feature is so bad. Great forum just the search function pulls up way too much useless info.
08-04-2012, 12:42 PM
#16
In the old days 1960-1970 tolerances were not as close as they are now. Running thicker oil would be OK not desirable though. I remember putting "Motor Honey" in my old 283's because the parts were worn. My LS1 still has the stock bottom end in it and I still use 10-30 Mobil1 with over 308,000 miles on it. Unless you live in fairbanks or someplace in Saudi Arabia I would just stick with the manual says. After all GM did design the motor they know what it needs. lol contrary to what some experts believe.
08-04-2012, 02:46 PM
#18
As covered 10w-30 can be THINNER than 5w-30.
Far as what the engine was "designed for" that is a pile of bull too because CAFE has a lot to do with North American oil specs. If you dig deeper you will find the same engine shipped overseas can have a different spec.
The far as desert heat, deserts tend to get cold at night which needs to be considered too.
Far as what the engine was "designed for" that is a pile of bull too because CAFE has a lot to do with North American oil specs. If you dig deeper you will find the same engine shipped overseas can have a different spec.
The far as desert heat, deserts tend to get cold at night which needs to be considered too.
08-04-2012, 02:59 PM
#19
As covered 10w-30 can be THINNER than 5w-30.
Far as what the engine was "designed for" that is a pile of bull too because CAFE has a lot to do with North American oil specs. If you dig deeper you will find the same engine shipped overseas can have a different spec.
The far as desert heat, deserts tend to get cold at night which needs to be considered too.
Far as what the engine was "designed for" that is a pile of bull too because CAFE has a lot to do with North American oil specs. If you dig deeper you will find the same engine shipped overseas can have a different spec.
The far as desert heat, deserts tend to get cold at night which needs to be considered too.
08-04-2012, 03:05 PM
#20
In cold environments yes 5w-30 is better than 10w-30 BUT that does NOT mean that in warmer weather 10w-30 is better. It is entirely possible to have a 10w-30 that is thinner than 5w-30 at operating temps. I have not looked at current analysis but at one time in the M1 lineup their 0w-30 was the THICKEST and the 10w-30 the thinnest with the 5w-30 falling in the middle of the other two.
the 30weight part is a RANGE not a precise measurement, some oils will be thicker and some thinner despite the "same" 5w-30 or whatever on the bottle.
the 30weight part is a RANGE not a precise measurement, some oils will be thicker and some thinner despite the "same" 5w-30 or whatever on the bottle.