cgper

Hi guys, I think its time for me to do a fluid change. I'm planning on using Mobil 1 75w90. Is this a good oil? I will be going to buttonwillow at the end of the month and forecast shows its gonna be about 100F that day.

I'd like to know what you guys are using.

Thanks in advance

spets

I'd rather use a bit of a heavier weight, like LE1605 or Amsoil 75w110.

INTJ

Orthonormal

I'm inclined to stick with the factory specification of a 90 weight (not multi-grade) GL-5 gear oil. I have been using the LE 607, and switched to LE 1605 although it has a higher viscosity (it is still GL-5). Next time I may try to locate Motul PA90, which is an SAE90 GL-5 oil.

I autocross only, no track.

WynnS123

I use 75/140 Mobil 1. It's specified for light trucks and SUV's.

Mark355

I just replaced my diff fluid with Mobil1 75w90 LS synthetic. Seems fine!

INTJ

LS is limited slip...

Emil St-Hilaire

Amsoil 75W140.

HotDamnitsDavid

Same here

CourageOO7

PuddyDad recommends a 75W140 for all track cars. I also use the Mobil 1. I just spoke to him about this and he says the 90W is not heavy enough. He says a minimum of 110 for street cars as it won't sheer down quite as much.