Switching oil brands

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56
Location
Los angeles, CA
I have been reading posts for a little while now. And I have picked up some good info. Considering different synthetics REdline, M1, Amsoil all have different properties would switching brands often cause premature leaks or other long term problems? Im reading on some posts where one oil will cause piston slap and others that dont but over time wear out seals. If this has been asked before sorry about that, but just trying to clarify some stuff thats got me confused.
 
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6,388
Location
Washington St.
Oil doesn't cause piston slap--engine design causes piston slap. Some oils work to diminish the slap and the noise level. I don't think that there are any commercially available brands of oil that damage engine seals. Ken [ March 04, 2003, 03:06 PM: Message edited by: Ken2 ]
 
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491
Location
Ottawa
This is an off topic question. Would it be ok to use synthetic in the winter and then in the summer switch to dino?
 
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152
Location
Ventura, CA
Rick, Toyota emphatically advises owners who switch to synthetic to stay with synthetic and not ever go back to dino. There are seal shinkage and expansion issues involved with switching back and forth that can lead of oil leaks. Example: if a rear main seal leaks 5-10 years from now it might cost you over $1000 to get it fixed.
 
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1,874
Location
Ocala, Florida
quote:
Originally posted by Malibu: Rick, Toyota emphatically advises owners who switch to synthetic to stay with synthetic and not ever go back to dino. There are seal shinkage and expansion issues involved with switching back and forth that can lead of oil leaks. Example: if a rear main seal leaks 5-10 years from now it might cost you over $1000 to get it fixed.
That is not correct. It might be from the dealer you use, but it surely isn't toyota's stance themselves. Fact is, there isn't anything to the effect of what type of oil except by api certification which both mineral and synth can meet. I don't think I've seen anywhere a study that establishes seal leaks from switching back and forth. I can also assure you from personally being involved with toyota corporate and local dealerships that there is anything to state such by them. If it is, I'd like to see this. The only way oil MAY cause seal leaks is if you're running a sub-grade dino oil past its intended usefulness, and it allows crud to accumulate on the seals, then lubrication cannot get to the seals, thus they dry out and the only thing keeping the seal from leaking is the coat of crud, then changing to a good synth where they oil has a better cleaning ability, and it cleans off this crud around the seal thereby cleaning off the existing seal that the crud has maintained, then it would begin to leak. IMO, and not fact, I'd say this issue would not occur provided you don't over extend your oil beyond its limits this will keep the engine clean eliminating this condition. Personally, I'd also consider just staying with one brand/type of oil just to keep everything simpler for convenience sake more than anything as either way, synth or dino, will give you more than adequate protection.
 
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