Are all full synthetics created equal?

Maybe some people get that way because they had a mom who cooked lousy breakfast. You know. Childhood trauma and whatnot.

Yup!
My friend got 3 years of free maintenance when he bought his Scion. His driving pattern is exclusively low-speed very short distances, so I reminded him of the need to change the oil at least once a year, and that it would be free of charge at the dealership. His response was
 “it looks clean”
 and also, “I don’t trust them to actually change it, so why should I bother”.

I urged him to get the oil changed–at an indy mechanic–but he persisted with his “it looks clean” mantra. After ~6 years of no maintenance, he wound up with some very expensive engine repairs.

I have another story about how he inevitably winds-up paying more while he thinks that he is saving money, but I don’t have time to post it right now.

Edited to add: The same guy got his bathroom window smashed by falling ice ~5 winters ago. He “repaired” it with a piece of cardboard, but then because the bathroom was so cold, he didn’t bathe for several winters. He used “baby wipes” instead.

Wife #2 (who didn’t live with him) couldn’t stand it any longer, and she insisted that he get the window replaced. The local glass guy quoted him a little more than $300, and he told the glass guy that he was “a G. D. thief” and told him to get out of his house. I was there to witness it, and it was really embarrassing. Anyway
 no window fix resulted in a divorce.

After he acquired wife #3 (who also doesn’t live with him), she couldn’t stand his really bad hygiene any longer, so she gave him an ultimatum: Replace the window, or I file for divorce.

He called the local glass guy–who remembered him and who refused to do business with him. He wound-up having the window replaced by Andersen, to the tune of ~$900.

As the old saying goes
 The guy who tries to save the most winds up spending the most in the long run.

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You are correct that the days of everything recommending 10W30 or 5W30 conventional oil are over. However I can’t help but think that a lot of these exotic recommendations nowadays are more about meeting CAFE requirements than about prolonging the engine life.

I suspect that one can put 5W20 or even 5W30 synthetic oil into just about any vehicle on the road, even if the official recommendation is 0W20 or 0W16, etc, and it won’t materially harm engine life or performance. Of course, during the warranty, I wouldn’t experiment, and would just have the oil changed at the dealer, to maintain proof of timely oil changes using the OEM oil and filter.

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My SAAB recommends 0-30 or 0-40 synthetic. In my area I have a serious “old school” dedicated SAAB mechanic - literally has a few lots full of old SAABs undoubtedly for parts, many of which are getting sparse by now. He’ll basically buy up and SAAB and keep it around. I think he still sells ones that can be put on the road.

Anyway, I went to him to get oil/filter for a change, and he sold me 5-30 syn explaining that the difference was so minuscule as to not matter. This is an '03 9-3 with a 2.0T. I supposed other years/engines could be different.

I stand corrected. Thanks.

Ironic eh?

The big Jiffy Lube Corp comes in undercutting the mom and pops and then raises prices higher than ever. Sort of like Amazon and Uber. I avoid all three.

Guess I was right after all!

When I stopped going there JL still offered the $39.99 oil service with mineral oil, it the synthetic service was $93.00. That was $20 more that the high priced but excellent shop I normally use.

Jiffy Lube was built around speed and convenience for the busy people, you pay extra for the no appointment needed 10 minute oil change vs the normally much longer wait of the normal repair shops

And NO, I don’t like them, and I could not stand Stu Crum and how he screwed up and over the company I worked for, he made some absolutely stupid changes
 I will leave it at that


you ever heard of variable valve timing? :thinking:

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Check the owners manual. My Miata owners manual has a table of other viscosity lubricants depending on the min and max ambient temperature range.

I know that Firestone shops use Pennzoil and have 3 large bulk tanks and one 250 (IIRC) gallon tank of different oil weights as well as 15-20 different oils in 6 gallon bag boxes that they use, so they have just about anything you need when changing your oil


And? So does every vehicle I’ve ever owned. What does that prove?

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It means that more than one lubricant is suitable for the vehicle.

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Again So? It doesn’t negate anything I said. Show me the vehicle that says 0w-20 AND 10W-40 are acceptable for the same vehicle? The range of oil differences is narrow.

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When I saw owner’s manuals with multiple oils cited, it was for different ambient temperature service. There was some overlap, but colder temperatures required lower viscosity oils.

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That must be an older vehicle. Most vehicles sold in the United States during the lest 20 years recommend only one oil viscosity.

For example:

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My Wife’s new Crown says to use 0W-8, but 0W-16 can be used if 0W-8 isn’t available, then switch back at next oil change. 0W-16 is the recommended oil for the Rav4 and other Toyota vehicles with the EXACT SAME ENGINE. I’ll probably use 0W-16.

Does the Crown have the 2.4L or 2.5L engine?

2.5l Engine. Same as Rav

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