Have several questions here - anyone feel free to comment, thanks.
1. On a trip through Utah and Colorado I noticed a lot of 85 Octane (not Ethanol). Most car manuals I've read say 87 octane is the lowest (including mine). This is the first time I've seen 85 octane. Is it ok to use? It was noticably cheaper...
2. For someone who has used synthetic in their engine would it be ok to use a semi-synthetic? I've heard going from synthetic to dino is bad but dino to synthetic is ok. What bout going from full syn to semi-syn? Had a friend ask.
3. In efforts to obtain an accurate UOA with a specific brand is it necessary to "flush" out the old oil by doing several runs of a new brand? I usually let my car drain for 30min-1hour. If I drain brand Y for 1 hour put Brand X in will Brand Y affect X's UOA?
3b. Due to oil add pack difference it would seem to me that running different brands of oils now and then should result in a cleaner engine due to the different add pack cleanings? Is this a correct assumption?
Thanks,
-Paul
1. On a trip through Utah and Colorado I noticed a lot of 85 Octane (not Ethanol). Most car manuals I've read say 87 octane is the lowest (including mine). This is the first time I've seen 85 octane. Is it ok to use? It was noticably cheaper...
2. For someone who has used synthetic in their engine would it be ok to use a semi-synthetic? I've heard going from synthetic to dino is bad but dino to synthetic is ok. What bout going from full syn to semi-syn? Had a friend ask.
3. In efforts to obtain an accurate UOA with a specific brand is it necessary to "flush" out the old oil by doing several runs of a new brand? I usually let my car drain for 30min-1hour. If I drain brand Y for 1 hour put Brand X in will Brand Y affect X's UOA?
3b. Due to oil add pack difference it would seem to me that running different brands of oils now and then should result in a cleaner engine due to the different add pack cleanings? Is this a correct assumption?
Thanks,
-Paul