Simple question...

[lakeq45]

Simple question with insanely complicated answers I'm sure and may have been covered before.

What oil does everyone use and why?

I know a lot of this is personal preference, but I am sure a lot of you guys (and girls?) on this board have a strong opinion. I could spend the next life time doing google searching or just ask.

[96Qowner]

Here's an old thread on the subject. I think most here use Mobil 1.

zerothread?id=131359

[Q45tech]

Over the last 16 years my Q has received dealer oil Valvoline 10w30 for about 95% of the first 100,000 miles and Mobile 1 10w30 synthetic for the next 170,000 miles and back to Valvoline 10w30-40 for the last 37,000 miles. At 300,000 miles I switched to 10w40 to cut down on consumption!

Much more important than WHAT OIL YOU USE is how often you change it!Not so much the oil as the small tiny filter area and the chance of the filter going into bypass mode at high rpm/load [passing and 75-80 mph cruise].

As the oil evaporates it gets thicker and the oil pressure goes up and thus the closer you get to filter bypass.........the only fix is to use a synthetic which evaporates less or change the conventional oil faster.

Even with synthetic I have never exceeded 5,000 miles and always change the oil every 90 days even if the car sat most of the time!

The 90day oil change at dealer was to allow them to work hard to find WARRANTY things that could be fixed to allow them to make money. I encouraged them to spend time on finding things especially from 60,000 to 100,000 on the paid for by me extended warranty.

I was very sucessful my $1500 in cash got me $8,000 in replacements!

The above was for a Q used in SE US never being driven north of Virginia except a few times in Summer.............your location will determine the viscosity you should use

307,000 miles and still meets oem spec [14 psi] for oil pressure hot idle in SUMMER.

The problem with buying a used car is you can almost be assured that it will not have been maintained this well.

Testing oil presssure and graphing it vs coolant and rpm tells you what to do.

[bullittandy]

Whatever synthetic oil is on sale or has a mail in discount. Valvoline Maxlife this time (free with mail in rebate)I drive about 2000 miles per month and change it on a 6000-8000 miles schedule. I know-I know supposed to be 3750 miles but synthetic lasts longer and 60 MPH for an hour (my commute) is nothing like stop and go traffic. I really don't thinks its the oil, its the change interval and driving style.

[Jesda]

http://q45.org/oil.html

[superuber]

My owners manual says to use 5w30. I use mobil 5w30 because thats what I have bulk at the shop. I change oilevery 1K and filter every 10K, I am using a racing filterapplication. I agree, its interval more so than what brand.

http://community.webshots.com/user/neheadsuperuber

[Falkdesigns]

I only use Amsoil, (used Redline once- also great stuff). I now use the new Amsoil EA filters (just like their oil, this is THE BEST oil filter on the market now), guaranteed for 25k, and I change oil roughly once a year (under 10k).