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Old 07-15-2002, 03:08 PM   #1
mibobe
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Default Switching back from synthetic to regular oil

Assuming the oil filer was changed as well, wondering if that would pose a problem for the engine. Thanks in advance for the feedback.
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Old 07-15-2002, 03:12 PM   #2
cnk
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Shouldn't be a problem. . just don't switch back and forth. If you're going for conventional, then stick with it. . .same for synthetic.

Calvin
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Old 07-15-2002, 03:34 PM   #3
z&cobb
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Quote:
Originally posted by cnk
Shouldn't be a problem. . just don't switch back and forth. If you're going for conventional, then stick with it. . .same for synthetic.

Calvin
I just browsed a book on making HP at the book store. It didn't have a section on turbo engines so I didn't buy it. However, there was a general section on what to do for high output engines at high rpms.

He said most racers want heavy oil because they fear the heat thinning effect. He said it is better to put on an oil cooler and use thinner oil. Just before a race he goes one stage lower in viscosity than he would normally use and takes that dino oil and makes it 25% Mobil I synthetic. This gives him 6HP more at high rpm. He also runs with oil at the lower oil fill mark because of the crankshaft "egg beater" effect and gets 10HP more by doing that.

Any comments on these "tricks?"
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Old 07-15-2002, 03:40 PM   #4
cnk
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No idea. . never heard of these tricks before. I'm going based on what I've read in other forums when this question has arisen. Conventional oils and synthetics are made differently. Mixing them is not a good idea. When you drain out your oil, you're not getting all the oil. There's usually oil left in the engine that you just can't get to. When you put in new oil, it mixes with the old oil. If you keep switching between the different makes of oil, you're just going to get a mixture and I don't think that would be too good for the engine.

Someone else correct me if I'm wrong, but I for one have never switched oils back and forth. Don't even mix them if I'm out, i.e. only have 4 bottles of synthetic so drop in the remaining with conventional.

Calvin
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Old 07-15-2002, 04:15 PM   #5
mibobe
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Thanks for your reply Calvin. I totally agree that one should not switch the two types of oil back and forth. My problem is when I had my car bought to the dealer for oil leak repairs, they drained out all the synethic oil and replaced it with the regular one. I did not think much of it until a friend of mine mentioned that might not be good for the engine. I definitely want to switch back to synethic when my next service is due. Shall I drain out the regular oil now even though I have been running the car for almost 3 weeks now or is it alright to leave it as it is until my next oil change? Cheers.
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Old 07-15-2002, 04:30 PM   #6
gotwrx
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From what I can tell the bottom line on this one is that no-one knows for sure.

The best advice seems to be

1. Don't mix grades, brands or oil type in a an oil change.
2. Once you switch types stick with it
3. Change it at least every 3K/3mos anyway
4. Use the recommended grade

The rumoured issue is that switching to synthetic after a lot of use with dino is that the oil seals may start to leak. Others say this is rubbish. Haven't read anything bad about going the other way.

I doubt you'll have any problems but there is a possibility you may. Oil seals seem to be the only possible failure mode so, probably, worst case you may have to have them replaced.

If you're not a gambler I'd stick with synthetic just because. If you are then switching to dino will save you some money.

Tim
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Old 07-15-2002, 04:49 PM   #7
cnk
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I would think that since the oil's already in there. .just leave it there and switch back to synthetic the next time service is due.

Calvin
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Old 07-16-2002, 02:09 PM   #8
Stanley
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Quote:
Conventional oils and synthetics are made differently.
True, but they are totally compatible with one another. I think it is better to have the same brand and type of oil in the car. But it is nothing to get upset over if a little bit is mixed. I plan on sticking with synthetic for the life of my turbo car because of it's superiority in terms of thermal breakdown.
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Old 07-16-2002, 05:50 PM   #9
Genner
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If i'm draining my conventional oil and changing it to synthetic, would it be ok or a waste of money or even pointless if i decide to flush the conventional oil out with a bottle of synthetic oil w/ the drain plug off? Would this help to flush the rest/most of the conventional oil out?
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Old 07-16-2002, 05:52 PM   #10
cnk
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To be honest, you'll never be able to get all of it out. Just refill it and after a few more oil changes, most of the conventional oil should be gone.

Calvin
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