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Mobil 5000, Pennzoil, Valvoline, Castrol GTX, Havoline. They are all dino oils similarily priced. I read a lot about most of these except Mobil 5000. Does it really make a difference which one I choose?

I have almost 5 quarts of left over oil mixed in a container. My car takes 4.5 quarts and I always dump the other half quart into a container. Now it's almost full. It's all M1 with a mix of 5W-30 and 10W-30 and has been sitting there for a couple years now since I change every 6 months. Would...

Since I've been reading that M1 now has Group III in it I think I will switch to Pennzoil Platinum. I can get it cheaper than M1 anyway. Is it still true that PP is group IV/V?

Why is Trop Artic so cheap compared to other synthetic blends?

We all know the leading synthetic oils are Mobil 1, Amsoil, Redline, and Pennzoil Platinum. Let's forget about those for now. How would you guys rank these synthetics: Valvoline Synpower Castrol Syntec Quaker State Advanced Engine Quaker State Torque Power Super Tech Synthetic Havoline Synthetic ...

Looks like Quaker State is trying harder to compete with M1 and PP with Q Torque Power. It's heat activated ya know. www.qpower.com

I have a 98 Grand Cherokee 4.0L with 85,000 miles. I've been using Mobil 7500 in it, but have been thinking about switching to M1. The thing is, the rear main seal is weeping. I know that synthetic can flow by the seal better than regular oil and potentially leak. Do I dare try it, or not?

What oil would you guys use in extreme winter temps? I'm talking about -40F. It does get that cold here.

A couple of weeks ago I opened up my front diff. to diagnose a problem. Problem is I need new spider gears. So I put everything back together and put new lube in it. I now have the parts and will be replacing them within the next week or so. Question is, should I reuse the lube I have in there...

Just saw a coupon for an oil change at the local GM dealership. Here is a line from it: "Up to 5 qts. Mr. Goodwrench Oil". Exactly what is Mr. Goodwrench oil?

Just went into Advance auto for the 3rd time ever and noticed they have their own brand of oil. Does anybody buy this stuff?

After looking on the Shell website and browsing through Walmart today, I noticed something. The Supertech bottles use the same color scheme as the Formula Shell. Except that Supertech has no blend. This is Shell: Conventional - White bottle High Mileage Formula - Red Bottle Synthetic Blend -...

Hi, I just got a new job and moved to a bigger city. My old job was a 30 mile drive away all highway. Now it is about 5 miles in the city. Most of that is interstate. What I want to do is change the oil every 6 months because up here in North Dakota I want to switch to 5W-30 for the winter. I...

Went to WM tonight looking through the oil section and found Tropartic for $1.47 a quart. I couldn't believe it. 50 cents less than the next cheapest. I've been reading Tropartic is pretty good oil. I might start buying it for that price. Could I go 5k with it?

They say that the high mileage oils have seal conditioners in them to swell seal to stop leaks, right? I assume this oil is to be used before any real leakage problems occur. My rear main seal is weeping and is moist, but no drips. Would it be a bad idea to use a HM oil with this?

What oils are synthetic-blend or "synthetic" with nothing less than group III in them. To re-word that, what oils has only group III or group III and IV. No group II. I was looking more specifically at these, but feel free to add more. Motorcraft blend Tropartic blend Castrol Syntec blend...

I need some suggestions on what oil to use for my Jeep Grand Cherokee 4.0L. I was using Mobil 7500 and the stuff worked great. But now I just moved to a different city and cannot find the stuff anywhere for cheaper than $3.30. Walmart doesn't carry it here, and I used to get it at another WM for...

A few years ago (more like 7-8 years ago) my dad replaced the fluid in the diffs in his 93 GMC Sierra. He put in synthetic and the front dif started leaking like crazy. The rear leaked too but not as bad. So he replace it with conventional again. I don't understand why the synthetic fluid would...

Is it ok to mix different viscosity oils? I had a half quart extra of both 5W30 and 10W30 and just dumped them together. The 5W30 was M1 EP and the 10W30 was M1. Would it be ok to use this in my car for the next oil change?

I don't know much about UOAs and I have never had one done. But I have seen many on this site and had a few questions about them. What do you look at when you analyze a UOA? I see they list all these minerals such as iron and sulfur and whatever. Isn't the real important numbers in the viscosity...