the numbers for oil weights refer to a standardized Society of Automotive Engineers' specs where the first number refers to the flow during winter( less viscous ) and the second refers to a higher viscosity ( less flow )during hotter days. With 0W-30 oils there is a max temperature beyond which such low viscosity during hotter days might be detrimental to the engine. with Synthetic oils, which are more a plasticizer then a petroleum product, the molecules are smaller and more "durable" therefore for comparison purposes a 10W30 synthetic's lubrication capabilities are as 5w30 convential oil's.

Hey guys I have used Mobil one in every car I have owned, and Live by it. Expensive yes, but you can get the five quarts container at Wal-Mart for cheeper than any parts store. Also if you have Sam's club you can sometime find it there.
Nick

I've been staying with Mobil 1 mixed with a quart of Greased Lightning, filtered by an oversized K&N. I've never, ever had a problem with my car, and she drives like a dream.

When I change the oil every 3K, the oil almost doesn't look dirty like in some cars I've owned where it comes out black.

I also just got the tranny flushed and used some Lucas tranny additive and was pretty happy with the results

Been using Pennzoil 10w-30 Nov-Apr, and SAE-30 May-Oct. 98 3100 has 90K miles now. With 10w-30, engine uses 1+ quart between oil changes (approx 6000-7000 miles). With SAE-30, oil level drops less than 1/3 quart between changes. That tells me something about viscosity breakdown with multi-grade oils.

With 90K miles on car and mild Sandy Eggo winters (garaged car start temp never less than 55F - I doan need no stinkin multi-grade), I'm gonna switch to SAE-30 Nov-Apr and SAE-40 May-Oct from now on.

Filter will be long-can AC PF-52.

Run straight SAE-40 in my new air-cooled Intruder motorcycle year round. Occasionally ran SAE-50 Aircraft Oil (flashpoint 500F+) in my Virago motorcycle when making a trip where hot temps could be expected (low-sided the Virago a year ago trying to ride it like a Stearman, so it's outa the picture now).

Regards, Gary in Sandy Eggo

I use Purolator Pureone PL24011 for $5.99 at Pep boys. Mobil1 5W-30 SuperSyn oil.

Did you know that with synthetic oils you can often extend the time between changes? I know a guy with 150k on his GP GT who only changes his oil once every six months and his filter once every three months. He drives about 15k plus a year.
Just my .02,
Jeff

I drive 30k a year and I sure as hell do it every 5k. But this all goes back to me being anal retentive...

I use castrol syntec in our 03' Vibe GT and swear by it, going to put it in the GP aswell..

As I stated before I used to have a 1990 Mercury Cougar XR& 3.8SC, with about 135,000 on it and pushed, 300hp, 380 torque out back. All this was done on stock internal and the motor had never been appart since new until 121,987 miles rolled around and the #4 fire ring on the head gasket let go. I then found it to be a good time to pull the motor and do all new gaskets and sensors and anything else that needed or could need to be replaced. Since it had 35K on it it was running convensional Valvoline 10w30 every 2K. Then it was broken into Snythetic blend every 2K and then at 45K it went to full Mobil 1 every 3K. I have highly detailed pictures of the inside of the moror, after I pulled it at 121,987. THere is absolutly no wear on the motor what so ever, and the lifer valley looked brand new, with not even the slightest apperance of sludge or "valley rocks". I contribute this to the use of a good quality motor oil and proper maintence, especially Mobil 1.

As a pilot I know for a fact that oil has much more to do with the opperation of the motor than just keeping thing from rubbing. Further more, ask you ASE certified automotive Tech.

This sounds like a commercial.

Castrol GTX in all our cars, PF-52 oil filter in the '98 Grand Prix GT, oil changes every 3-5k miles......

welcome BlownPrix to the list...I'll bet it would have been fun running my TTA against your old Merc......I suspect you would have found it more challenging than that vette you left smoking on I-95...

Turbo Trans-Am's are awesome cars. Cal Hartline is currently building one in Melbourne right now that is bad-ass. I have 2 friends at school with a GN and a T-Type.The GN is hi-11's low-12's, and the T-Type is a Turbo Street Modified (TSM) car built by Hartline, that'll do high 9's.

I realized that after I typed it. Its like fuel too, everyone thinks that all fuels are alike. They're not, its all about the additives that the companies put in. You get what you pay for.