I had to get some oil today for an upcoming oil change on the Intimidator SS. Went to Wal-Mart for the 5 qt jugs, and the selection was very limited. I was looking for Q horsepower in 5W-30 ($18), but no such luck. So I started looking at the backs of the jugs to see what "claims" to be GM4718M approved. When I picked up the jug of Mobil 1 in 5W30 ($26) I was SHOCKED to NOT find the GM4718M rating on the back! Where I DID find it was on the back of the Mobil 1 0W-30 "Advanced Fuel Economy" oil.

Must be all the battering Mobil 1 took from the competition has caused them to change their labeling!

SO DOES THIS MEAN WE ARE TO NO LONGER RUN MOBIL 1 5W-30 IN OUR S/C and TURBO CARS, BUT WE ARE TO RUN 0W-30 INSTEAD?

The only other jugs of oil carrying the GM4718M approved rating in the label were the synthetic Pennzoil Platinum and Valvoline Synpower ($23). After checking out the Valvoline site just now, I realized I could've gotten a 5 dollar rebate coupon for the Valvoline, saved 3 bucks, and gotten oil that Valvoline claims to be as good as Castrol Edge. I might just take the Mobil 1 0W-30 back and get the Valvoline. Check out the Valvoline web site here:

http://www.valvoline.com/synpower-we...FRAhDQodIH5oFQ

 

This is news to me and I sell the stuff. Oil is far too complicated these days. I'll stick with Mobil1 5W30 anyways

 

I use AMSoil, runs real well in my car. more pricey, but works great.

 

I thought the supercharged motors took 10w30 year round.Thats what my bonneville calls for.

 

that's what i been using mobile1 10w 30

 

I use the quaker high mileage lol

 

i just switched to RED LION full synthetic 10W-30 and it runs so much better and smoooooth

 

oops, boosted people only, nevermind :P

 

For 2004, GM changed the oil pressure spring for the supercharged engines and with the new oil pressure setup they recommend 5w30 year round. The 04+ Grand Prix, as well as the '04-'05 s/c Monte and Impalas call for 5w30.

ZZP sells the updated spring setup as an upgrade for the '03 and before cars.
http://www.zzperformance.com/grand_p...=219&catid=109

-Riggs.

 

I don't know I have always stuck with natural Pennzoil Oil for both Montes - 5W30 for Silver and I am guessing 10W30 for Precious (haven't seen Precious since Nov so I forgot what viscosity it takes LOL.