Just wanted to know how many use just regular non synthetic oil. And what do you use. Valvoline? QS? Castrol? 5-30? 10-40?

I run synthetic, but when I do oil changes on my parents cars I run Valvoline.

Oil is Oil............... i run 10-40

I love the "oil is oil" idea. :huh:

www.bobistheoilguy.com

Oil is certainly just oil, but Oil A can differ from Oil B 100% and yield different results for OCI, mpg, smoothness, noise, etc

I run Group-V Redline 5w-30 at all times.

Pennzoil 5W-30...ive ran it in all of my car(3 of them) and have torn down one motor ran on pennzoil for 200K miles, and it looked brand new.

5Q(4.5 in car) Pennzoil 5W-30
1 filter...pureone on there now..dont know number
1 fumoto valve
=ftw

it's all about how often you change your oil. however, oil makes different engine out-put result.

I have run Millers CFS 10W-60 ever since I bought my classic. . .

Viscosity and oil change interval is more important for you running a Stage 4 WRX in the Southeast. Use 10W40 of any brand and do a used oil analysis at 4,000 miles.

I use conventional oil in my wife's 99 Outback. I used to use 5W30 Castrol GTX but switched to 5W30 Havoline after reading up on bobistheoilguy.com. Both oils gave me good used oil analysis results except for shearing down to a 20 weight in 4k miles. Imagine what a stage 4 WRX would do to a 5W30.

-Dennis

Viscosity and oil change interval is more important for you running a Stage 4 WRX in the Southeast. Use 10W40 of any brand and do a used oil analysis at 4,000 miles.

I use conventional oil in my wife's 99 Outback. I used to use 5W30 Castrol GTX but switched to 5W30 Havoline after reading up on bobistheoilguy.com. Both oils gave me good used oil analysis results except for shearing down to a 20 weight in 4k miles. Imagine what a stage 4 WRX would do to a 5W30.

-Dennis

When you say of any brand of 10W40 is that in Synthetic, non or Blend. Thanks

When you say of any brand of 10W40 is that in Synthetic, non or Blend. Thanks
Non-synthetic.

I run Castrol 5W30, and change it and the filter religiously at 3,000 miles.

I run Group-V Redline 5w-30 at all times.

Excellent choice.

If you have any stage 4 or above 5-30 in my opinion is not going to cut it. 5-40 or 10-40 or 15-50 is my personal favorite.

the owner/head mechanic of metric subaru swears by castrol GTX non systhethic 10w-40... hes been a subaru mechanic for like 15 years... plus tuning and modding a ton of them... most people on LI run 10w-40 and it works just fine

That is exactly what i am running right now^^^^^^^its a cheap good choice.

I run 5w30 in our two basic trim Impreza daily drivers.
I ran 10w-30 over the summers for awhile and swear I lost MPG (plus it was a PIA) so I just went to 5w-30 all the time.

I'm still debating on if I should run synthetic in the turbo. I probably will though.

Just to add to my comments above in post no. 8. Even if you use a 10W40, chances are that it is going to shear to a 30 weight if it's a conventional oil. There is a Forester XT owner in TX that ran GTX 10W40 in a stock FXT and it always sheared to a 30 weight in under 3,000 miles.

IMO that's better than using a 30 weight (even with some synthetics) and having it shear to a 20 weight, but also why it's a good reason to use a shear stable synthetic oil (German Castrol, Redline, ester based Motul oils, etc.). Any of those oils could probably go to 7,000 miles or more with no problem. If I used conventional, I would actually do an analysis on the oil at 3,000 miles if I were you.

-Dennis

I run Chevron Supreme 10w-30. I've just sent off for my 1st oil analysis @ 80K, but it's well documented at BITOG that Chevron is a top rated dino oil. For the price vs. performance/protection, it can't be beat.

I guess the only downside is that it can be hard to find. I get mine at Costco, by the case. :banana:

MT :devil:

I run Chevron Supreme 10w-30. I've just sent off for my 1st oil analysis @ 80K, but it's well documented at BITOG that Chevron is a top rated dino oil. For the price vs. performance/protection, it can't be beat.

I guess the only downside is that it can be hard to find. I get mine at Costco, by the case. :banana:

MT :devil:

Kragen, Schucks, Checkers routinely carry Chevron Supreme.