What oil to use in your Engine, Trans, Diff?

[tonystewart]

Red Line 75w85 made the rear diff quieter

[2015FRShalo]

I'm do motul gear 300 for the trans, for the diff I'm thinking a redline GL5 75W85 or the motul gear 300 which is an acceptable substitute(I'm just waiting on feedback of people who've used either or for the diff), for the oil I'm do royal purple 0W20 because of all the positive reviews and I'm go with a Subaru oil filter. I hoped this helped you out.

[2015FRShalo]

Actually guns use amsoil 0W20 for the motor oil then royal purple and see the difference, any experience from anyone on the brands I listed?

[JEDI]

I used Royal Purple 0w-20 for engine.
Royal Purple 75w-90 for both Trans and Diff.


Here's a pic of my Differential Drain Plug after 9900 miles.
I bought the car with 9560. I'm hearing this is common in our cars, but not fact. Sorry for the huge pic.

[JEDI]

Oh and I should mention this too. Right now at Pep Boys when ordering online, any orders over $75 receive 25% off. This offer changes weekly. Last week I bought 6 quarts RP 0w-20 and RP Oil Filter and 1 quart of the RP 75w-90. At the time of my purchase the offer was 35% off any orders online over $100. Then arranged in store pick up. My total was $67 and some change (basically I got the filter and quart of gear oil for free). I'm not a big fan of Pep Boys but purchasing this way from them was awesome savings for a quality product.

[Bergen23]

Personally, once my free oil changes are all used up at the dealership, I'll be going with a fram oil filter and whatever oil is on sale at Canadian tire. I'be been doing that with my past 2 cars, my dad does it with his truck, my brother does it with his car, and countless numbers of friends do that with their vehicles and no one has had any ill effects.

[wparsons]

^^ I wouldn't do that if you plan on driving the car hard at all, especially track use. If you have any doubt, send the oil out for analysis and see what comes back.

[Bergen23]

Originally Posted by wparsons

^^ I wouldn't do that if you plan on driving the car hard at all, especially track use. If you have any doubt, send the oil out for analysis and see what comes back.

I don't do track days, I don't drive the car hard on the street. It's worked for me for 8 years or so, worked for my dad for 35 years or so (And he's had quite a few sports-cars). I have no doubts, and I know what's worked for me.

[wbradley]

Mobil 1 0W40 European formula. Supposed to be the best base stock available in a regularly priced synthetic. Good for track and FI applications for the twins. Has a green tint to it!
Now I need to find an oil cooler that will fit beside the humongous Stg 3 intercooler I just had installed. Or spring for the HKS unit that goes in the wheel well.

Haven't touched the tranny/differential oils yet.

[2015FRShalo]

Originally Posted by JEDI

I used Royal Purple 0w-20 for engine.
Royal Purple 75w-90 for both Trans and Diff.


Here's a pic of my Differential Drain Plug after 9900 miles.
I bought the car with 9560. I'm hearing this is common in our cars, but not fact. Sorry for the huge pic.

How's the car feel once you used royal purple for the engine?

[Ultramaroon]

That's normal. It's how a mag plug works.

Originally Posted by JEDI

I used Royal Purple 0w-20 for engine.
Royal Purple 75w-90 for both Trans and Diff.


Here's a pic of my Differential Drain Plug after 9900 miles.
I bought the car with 9560. I'm hearing this is common in our cars, but not fact. Sorry for the huge pic.

[krayzie]

Originally Posted by Bergen23

Personally, once my free oil changes are all used up at the dealership, I'll be going with a fram oil filter and whatever oil is on sale at Canadian tire. I'be been doing that with my past 2 cars, my dad does it with his truck, my brother does it with his car, and countless numbers of friends do that with their vehicles and no one has had any ill effects.

OEM Tokyo Roki oil filter from Japan is like just 10 bucks tax in at the Subaru dealer so don't cheap out with a Fram (compare to OEM VW/Audi Mann filter which is like 25 bucks the Tokyo Roki is a bargain). The OEM 0W-20 oil from Toyota is also pretty good and it isn't expensive either.

Take care of the engine and the engine will take care of you.

Originally Posted by wbradley

Mobil 1 0W40 European formula. Supposed to be the best base stock available in a regularly priced synthetic.

I once heard that best base stock is from Shell (i.e. Shell Helix, Motul 300V, German Castrol EDGE). Is Mobil 1 0W40 European Formula a Group V oil?

I'm running Eneos Sustina 0W20 Group III+ with STI Tokyo Roki oil filter for the engine and Eneos Gear Oil 75W90 (basically Subaru Extra-S) for the gearbox and diff.

Will probably switch to Eneos Sustina 0W50 for the next oil change to run in the summer and autumn months.

[wbradley]

Originally Posted by krayzie

Is Mobil 1 0W40 European Formula a Group V oil?

It's a group IV oil which means it's a pure synthetic polyalphaolefin PAO whereas any lower group number is a modified petroleum based oil. Group V is other bases such as silicone, not used by itself but as an additive to other oils.

Very few oils, all of them premium, are PAO based. Its a great deal if it suits your requirements, in my case supercharged.

[krayzie]

Originally Posted by wbradley

It's a group IV oil which means it's a pure synthetic polyalphaolefin PAO whereas any lower group number is a modified petroleum based oil. Group V is other bases such as silicone, not used by itself but as an additive to other oils.

Very few oils, all of them premium, are PAO based. Its a great deal if it suits your requirements, in my case supercharged.

I used to run Motul 8100 X-Cess on the VAG 2.0T which is also a Group IV, had the highest ZDDP content that I could find for the weight I needed.

Interesting how TRD Performance sells a 0W30 oil made by Total, and STI Peformance sells a 5W40 oil made by Motul for the 86/BRZ recommended for track use.