Dougs951S

Don't think my oil pressure dropped below ~3.5 bar on the track today, running Mobil 1 synthetic 15w50 and STP oil filter( same as OEM I've been told ) and factory oil cooler.

URG8RB8

I use the synthetic but think you will also be fine with VR1 conventional if you change every 3000 miles on a street car. There is nothing wrong with the stock filter, but there will soon be better filter options, stay tuned. Quite a bit has changed in filters during the last 5 years.

Best to have your oil tested to find out a little bit what is going on with your engine. Of course you will need to do this several times after each change.

Grant27

So really it just comes down to choosing which brand you have the most faith in?

Valvoline VR-1, Mobil 1 Synthetic, etc?

What is the best brand of oil, weight, and type (conventional/synthetic) for street use in your opinion?

Paulyy

Oh man not another oil thread.

If you live in a normal temperature area. Like from 0°c - 40c... 20w-50 is the oil you want

I use semi synthetic. i wouldn't use synthetic as it'll strip the minerals from the bearings and may cause damage. And if you have small leaks with normal oil, the synthetic oil will turn them into larger leaks.

Thom

Some pretty tuned up engines I know run on Liqui Moly 10W40.

I personally run 15W50.

All fully synth, OF COURSE

blade7

I used to run 5W40 full synthetic and had a tiny but persistant oil drip, switched to 10W50 triple ester PAO synthetic (Millers CFS) and the leak stopped.

333pg333

I think that Millers product sounds pretty good. Having said that, "If it ain't broke, don't fix it comes to mind".
:-)

blade7

It's not the new NANO stuff, that's really expensive .

User 52121

Motul 300V
Joe Gibbs DT50
Brad Penn
Millers

All these are high in zinc and hold up well to track abuse, can't go wrong with either of these.

Grant27

Seems like a lot of differing opinions on synthetic or conventional?

FYI this 86 turbo was just rebuilt with new seals, bearings, water pump, etc. if that makes any difference!

User 52121

Yes lots of opinions.

Some good information here: http://www.bobistheoilguy.com/

I've also witnessed a couple different presentations on oils from Charles Navarro of LN Engineering, he's done a ton of research on oils used in racing engines. I've been running whatever he recommends.

jg951

+1

rlm328

I would add Royal Purple to this list.

For filters I would go with Mahle Filters. The 944 filter has a check valve in it to keep the oil from draining out of the filter. While it will not damage the engine not having it, with it you eliminate the annoying valve clatter at start up.

pole position

Mobil 1 V twin 20-50 has also a high zinc content Like 1500 from memory.

EVOMMM

redline oil did a comparison and proved that 0-40 is the way to go the owner uses it on his 911 turbo
it has better cold start properties where most damage starts
Mike