engine oil

[jun2831]

Which one (oil)is recomended for 06 Envoy SLE?

[ScarabEpic22]

Umm, it should be a quality 5W-30, I prefer Amsoil synthetic but a lot of guys run Mobil 1 because it is much easier to get than Amsoil.

[MTPockets]

Yeah, the manual for my 2005 4.2L doesn't give you too many options. It says "5w-30 is best for your vehicle" and synthetic 5w-30 or 0w-30 can be used if temps fall below -20degF :( It says "Do not use 10w-40 or 20w-50". I suppose it's best to go by the manual, but in warm temps, your 4.2L wouldn't notice the difference between a 5w-30 or 10w-30. They are both 30wts at normal op temps. I personally would not hesitate to run 10w-30 in HOT ambient temps.

G/luck
Joel

[dntnvme]

MTPocket gave you the best answer, It dpends on the weather temp. If a thicker oil is in a colder climate then it will take longer to reach proper level for operation, causing internal damage to your engine.

[tblazed]

I personally would not hesitate to run 10w-30 in HOT ambient temps.

That's all I have ever run in mine - conventional QS 10W-30. Ambient temp rarely ever gets below 32°F here. I don't drive enough miles a year to get my moneysworth from a synthetic and I change it twice a year anyway well before the OLI comes on. My I6 likes it. Engine's nice and quiet especially for a 2002.

A 5W-30 will start with a 5W base oil and they add Viscosity Improvers (VI) to make it act like a 30W hot. Starting with a 10w base oil for 10W-30, they don't have to use as much VI additive. This mostly applies to conventional "dino" oil.

[Ddubb]

Most cars with new engines use 5w30 oil .. if you have an older vehicle or high mileage I would recommend 10w30.

- Dan

[Black Ice]

Most cars with new engines use 5w30 oil .. if you have an older vehicle or high mileage I would recommend 10w30.

- Dan
My truck has always had 10-30 in it. and that was new a few yrs ago.

[tblazed]

Most cars with new engines use 5w30 oil .. if you have an older vehicle or high mileage I would recommend 10w30.

- Dan


Actually a lot of new cars spec 5W-20! My Trailblazer Owner's manual says on page 6-13 that 10W-30 is fine above 0°F and I prefer to use it for the reason I stated before - more base oil, less VI additive.

[MTPockets]

Yeah my 2001 ford windstar specs 5w-20 only, as does more and more vehicles these days. Since I had a bunch on hand awhile back I ran a few oil change intervals of it on my 2002 isuzu 3.2 that specs anything beween 5w-30 and 20w-50 :eek: . She ran as smooth as a top on it, but I got spooked (for no reason really) and went back to 5w-30, then tried shell rotella-t 5w-40, then sold her for the TB:weird: .

G/luck
Joel

[turbomike]

GM 6094M spec oil must be used

[tblazed]

GM 6094M spec oil must be used

No problem... I feel even more confident in it now!

QUAKER STATE® PEAK PERFORMANCE MOTOR OILS

• Performance in GM 6094 M specification (SAE 5W-30 and SAE 10W-30)

Looked in my 2002 Owner's Manual, doesn't get that specific just says use an API SAE 5W-30 or 10W-30, even straight 30W is OK if above 32°F. Did that 6094 spec even exist in 2002? It relates to cold flow only.

[MTPockets]

http://img.photobucket.com/albums/v260/wanmichael/6094M.jpg

[TBlazeruss44]

I don't see Amsoil on that GM list....Wazzup with that??? I know that GM has no problem with us using it,or any other motor oil, as long as it is API certified...:yes: