Anyone using heavier oil than OW-40?

[Fosgate]

My 23 ZR2 just hit 50K miles and used up all my prepaid oil changes meant for 100k miles because of the engine recall cutting the recommended oil change down to 3-5k miles. Was using 1qt per 1k miles of OW-10 until the recall hit and then changed to OW-40 Dexos R rated. I signed up as preferred customer with Amsoil and ordered 3 gal of their signature full synthetic OW-40 and filter that meets and exceeds Dexos R rating at wholesale and will change my oil myself going forward. (Can't trade out of it, no dealer will touch it or if they do show interest they will only go $20k below trade, even checked with relatives that manage mfg dealerships.) So I'm keeping it for awhile. Anyway. I stumbled across this video and I talked with a few mechanics and oil dealers and they agree with everything in it. So I'm going to buy a second old truck like a pre vortec, 350ci, no electronic anything. for my daily. But on my ZR2 I'm stuck running OW-40 until 2032 or 131k miles according to my warranty extension. after that I'm free to put whatever I want in it. I see other guys taking preventive measures with Dodge, Ford, Toyota etc saying screw the lighter viscosity oil and putting in stuff like 5w-20, 5w-30 etc. Curious if anyone is doing similar with their ZR2 especially if they are out of warranty (If one has made it that far).

 

[AXE]

The first number is only for cold weather starts, so if you live where it doesn't get cold, a 5W or 10W may be fine.

That being said, I have already done a few oil analysis on 0W40 and they looked perfect. Check out the oil analysis thread.

The dealers are now switching to Mobil 1 0W40 FS per GM direction. You can get a 5 quart jug for $25-27 at Walmart, so you have a couple quarts left for the next change.

 

[AXE]

I definitely wouldn't take a big hit on a trade. These are good trucks with a 10 year/150k motor warranty.

My service advisor said the motors are not even that expensive, so if you decide to run it post warranty, then a motor swap is still "affordable".

May as well drive it and have fun.

 

[MrScottly]

My 23 ZR2 just hit 50K miles and used up all my prepaid oil changes meant for 100k miles because of the engine recall cutting the recommended oil change down to 3-5k miles. Was using 1qt per 1k miles of OW-10 until the recall hit and then changed to OW-40 Dexos R rated. I signed up as preferred customer with Amsoil and ordered 3 gal of their signature full synthetic OW-40 and filter that meets and exceeds Dexos R rating at wholesale and will change my oil myself going forward. (Can't trade out of it, no dealer will touch it or if they do show interest they will only go $20k below trade, even checked with relatives that manage mfg dealerships.) So I'm keeping it for awhile. Anyway. I stumbled across this video and I talked with a few mechanics and oil dealers and they agree with everything in it. So I'm going to buy a second old truck like a pre vortec, 350ci, no electronic anything. for my daily. But on my ZR2 I'm stuck running OW-40 until 2032 or 131k miles according to my warranty extension. after that I'm free to put whatever I want in it. I see other guys taking preventive measures with Dodge, Ford, Toyota etc saying screw the lighter viscosity oil and putting in stuff like 5w-20, 5w-30 etc. Curious if anyone is doing similar with their ZR2 especially if they are out of warranty (If one has made it that far).

If you lived in another country, the owner's manual would tell you to put 5w-30 in it. Not because the engine is spec'd different, but because they are not trying to meet fleet fuel mileage standards. If it were mine, 5w oil would be that I would use.

 

[CO_Heil]

The first number is only for cold weather starts, so if you live where it doesn't get cold, a 5W or 10W may be fine.

That being said, I have already done a few oil analysis on 0W40 and they looked perfect. Check out the oil analysis thread.

The dealers are now switching to Mobil 1 0W40 FS per GM direction. You can get a 5 quart jug for $25-27 at Walmart, so you have a couple quarts left for the next change.

AXE, good info on the 0W40 thanks for doing some legwork for the rest of us. With that said, I read in a couple articles that 0W40 R supercar oil was the recommended and GM only went away from it because of supply and product access issues not because the other oil was just as good. The supercar oil is supposed to have extra additives etc. With that I have stuck with the 0W40R. Any thoughts or additional info on this?
My truck: I am at 43K, never over 4-5k on an oil change (don't' believe in any longer interval) and started using 0W40 early last year before the official recall. Passed the recall, no issues so far etc etc...

 

[AXE]

AXE, good info on the 0W40 thanks for doing some legwork for the rest of us. With that said, I read in a couple articles that 0W40 R supercar oil was the recommended and GM only went away from it because of supply and product access issues not because the other oil was just as good. The supercar oil is supposed to have extra additives etc. With that I have stuck with the 0W40R. Any thoughts or additional info on this?
My truck: I am at 43K, never over 4-5k on an oil change (don't' believe in any longer interval) and started using 0W40 early last year before the official recall. Passed the recall, no issues so far etc etc...

The only thing the Supercar has thats different is higher calcium content (detergent) which helps in high performance motors like the Corvette or supercharged 6.2Ls. A standard 6.2L isn't really high performance, so it doesn't benefit. Also the supercar has a lower viscosity. You can see that information in the oil analysis samples I've posted in that thread. Also I found similar information posted on Bob's the Oil Guy forum where the race guys go into much more detail than I can.

In my opinion, any quality name brand oil that is Dexos approved is gonna be as good as it gets. Nobody really knows what willl happen, but with your mileage, I think you may have a good one.