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Synthetic waste of money...my "opinion". I use 20/50 conventional and cars run fine.........one with 240 k and other 140K. Just change it frequently..thats the key. I do live in south so might, maybe, thin it out during winter if I lived in colder region. Work for oil company and had the pleasure of talking to scientists that formulate oil and they told me off the record that 0 weight oils aren't good for your bearings.....I know flame me but that's what I was told.
Callen 91 535i 94 530i 5spds
different strokes for different folks, i wont flame you. the "0" weight pumps faster to the bearings and lifters on startup which saves wear, the thicker stuff takes longer to pump into the small spots but will stay on the bearings a little longer but overnight that benefit is lost.
Your engines should run noticeably smoother, oil pressure will come up much faster during cold starts, and you can do only half as many oil changes.
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Originally Posted by callen
You say that synthetic is waste of money but I differ. I will always use synthetic from now on. My thermostat failed and my car started to over heat. Well, I was middle of nowhere so I decided to drive that way with heater ON. Yes, not good in my part to drive in this condition. I drove it almost one hour in that condition (on the red). I brought my car in and the shop replaced the thermostat. I asked them to check if I damaged anything else since I drove for almost an hour in that condition. They found everything else was in good working condition. No damage cause by me driving this way! I had Mobil 1 synthetic oil in my engine. I don't think the mineral oil could of protected my engine like the synthetic. Oils are cheap, even synthetic. In my opinion, extra $20 dollars for synthetic is worth the added protection.
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Originally Posted by callen
The concept that a 0w-40 oil is bad for your bearings is nuts. As others have said, faster lube on startup. The issues with VI improvers causing sludge are gone with good synthetics as they use very few and high quality VI improvers. In Mobil's case they use their proprietary SuperSyn (which they sell to other blenders).
Here is the way I view it. Mineral Oil Changed every 3750 miles= $1.50 quart x 12 quarts + 2 Filters x $8 = $34. Mobil 1 changed every 7500 miles = $5.00 quart x 6 quarts + 1 Filter @ $8 = $38. Is your time and trouble worth the $4? Mine is worth far more than that.
Cary
They must have stayed in a Holiday Inn the night before! That is one of the strangest comments I have ever read on these forums, even if it comes from "scientists that formulate oil".Quote:
Originally Posted by callen
Must be *baby* oil!