I am getting ready to change to synthetic for the first time. I notice that Amsoil sells a treatment that you run for 15-20 minutes before changing out the old oil.

Good idea or snake oil? Seems like several people on this list like Amsoil products. Anyone use or recommend this?

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles

I don't think I would use it but I would plan on changing the first batch of synthetic a little early on an older engine since it probably will disolve any crud that may be in there...... I doubt there will be much if you've been using a C rated oil and changing it regularly. When I changed to Amsoil in my truck I didn't use the pre-treatment stuff, just changed the oil.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k

With aircraft engines, it is generally considered unwise to switch to synthetic oil unless the engine is relatively "low time." Since synthetic oil does such a good job of keeping things clean, it can break loose a lot of crud in an older engine, which can block oil passages and wreak other havoc. The same principle should apply to any engine.

Wait you will destroy your engine Alan!!! Oh wait then I will win be default, ha ha ha ha ha ha ha (more evil laughing etc. )

It is probably a snake oil, 603's love synthetic, my lifters are much quiter now.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

The container says it basically does that with the oil you are about to remove. So you get more crud out with the dino.

Hatterasguy, dream on. I am not that far behind you. And I have a few road trips coming up. :p

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles

Yeah you are catching up! I thought you were 5k miles behing me. I guess I need to run it up and down the east coast a few times this weekend.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Just change the oil when its good and hot. That'll get most of the crud out. I have switched all my vehicles over to synthetic at high mileage without issue. Go for it. Much easier winter starting. RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

dont use it.

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have no worries.....President Obama swears "If you like your gun, you can keep it