The_Ginger_Stig Posted January 9, 2023 Report Share Posted January 9, 2023 I've seen all the posts that mention running 20w-50 in passing but there seems to be some people that caution against it. I was pleased to find that my local parts chain sells vr1 because I know the added ZDDP is supposed to be good for older heads and valve trains, but I also know that the FSM doesn't have 20w-50 listed as a possibility. Does anyone have any experience running a 20w-50 or even vr1 specifically? Link to comment Share on other sites More sharing options...
BlueCuda Posted January 10, 2023 Report Share Posted January 10, 2023 If you saw the bicycle chain that runs the oil pump on these things you would not want to run 20W50. 20W50 is harder to pump especially when it is colder. I can't see a need unless your engine is just slap wore out and has no oil pressure. 2 Link to comment Share on other sites More sharing options...
The_Ginger_Stig Posted January 10, 2023 Author Report Share Posted January 10, 2023 I thought a heavier oil would fair better in the Arizona 110+ heat and the oil pressure didn't change a whole lot just maybe an 1/8th more on the gauge at idle and under boost. I did end up putting it in because I had some free time to change the oil which I won't get more of for a bit, but would you recommend switching it out immediately or just at the next oil change interval? Link to comment Share on other sites More sharing options...
tux Posted January 10, 2023 Report Share Posted January 10, 2023 Turbos generally like lighter weight oil, from what i've read. Link to comment Share on other sites More sharing options...
BlueCuda Posted January 10, 2023 Report Share Posted January 10, 2023 I didn't look at your location. Arizona is the best place for heavier oil but still doesn't mean that it is needed. Link to comment Share on other sites More sharing options...
psu_Crash Posted January 11, 2023 Report Share Posted January 11, 2023 I've run Mobil 1 15-50 for over 20 years with no issues. Mainly because of the ZDDP content too. That Valvoline 20-50 should be fine in my opinion. Link to comment Share on other sites More sharing options...
kev Posted January 11, 2023 Report Share Posted January 11, 2023 I've only ever used 10W30 on these cars, specifically Castrol GTX 10W30. Never used synthetics or any different oil weights on a CQ for over 30 years with up to 7 different cars (modified or stock). I had a rod knock when I bought one of my current cqs in 1996. I drove that car for three years as a daily driver with the known knock using Castrol 10W30 oil changed every 3k miles! Yes, there was metal in the oil on each oil change but it never seized up! Finally was able to pull and repair the engine when I had the funds and another available car to drive at the time. So, I always ponder why people insist on trying other oil weights, etc. kev Link to comment Share on other sites More sharing options...
TexasQuest Posted January 11, 2023 Report Share Posted January 11, 2023 The owner's manual says you can use 20W-20, 20W-40 & 10W-30 in 32 degrees or above. 5W30 in 60 degrees or lower. I've personally used Castrol GTX 10W-40 in mine for years without issues. Link to comment Share on other sites More sharing options...
tsi_tom Posted January 13, 2023 Report Share Posted January 13, 2023 I run Castrol GTX 20w-50. No issues. It keeps my forged pistons quiet. I believe Indiana once showed a TSB from Chrysler recommending 20W-50. Link to comment Share on other sites More sharing options...
Dad Posted January 14, 2023 Report Share Posted January 14, 2023 I just switched to 5w30 from 10w30 since I have about 100+ psi on startup. running 80-85 psi at 65mph in 5th hot. Dad Dads Engine Parts LLC Link to comment Share on other sites More sharing options...
Contsi Posted January 26, 2023 Report Share Posted January 26, 2023 Is the TSB posted somewhere? Link to comment Share on other sites More sharing options...
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