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  #11  
Old 04-21-2008, 05:24 PM
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Originally Posted by corsair23 View Post
x2 - of course I was running 15W/40 vs 0W/40 as well till I switched out to the Mobil 1 for the winter



Ah yes...back on topic . For me it was 100K miles on both pretty much . Honestly once you're past the break in period does it really matter . I've read about people worrying about switching to synthetic after 100K miles and getting leaks and burning more oil than normal but I've never read about concerns on switching early.

As soon you have a good ring wear-in and engine temps normalize you can switch. Synth is too slick for break in but after thats done your golden!
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  #12  
Old 04-21-2008, 05:46 PM
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Dave,

There's as many opinions on this question as there are on choosing the oil itself. Some engines come from the factory with synth, whereas others think a looonnngg break in is necessary. I'm with you - not right away, but early. I switched my Tacoma over at around 6000 miles - I ran two rounds of dyno, drove conservatively for the break-in period, then jumped over to synth and have stayed there.

I'd say you're in a perfect spot to make the change!
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  #13  
Old 04-21-2008, 05:53 PM
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just change it now. like jacket says lots of motors come with synthetic from the factory and lots of motors recommend it over anything else. I think the leaky seal problem is not as bad as it was in years previous.. formulations have changed. I have run synthetic in moors that leaked, didn't leak, and leaked a little lately and have not noticed a change in leakyness. of course the second i say that...

but yeah, i had the tundra since new and threw synthetic at the first oil change. at 130k miles it ran fine with good compression, no oil consumption, no leaks, blah blah blah. then i totalled it. it was basically new still. it even ran while it was upside down for a few minutes and that didn't hurt it noticably. swap it over as soon as the budget allows.

my .02
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Old 04-21-2008, 06:05 PM
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This is when I have done most of my syn oil swaps on rebuilt engines. This gives a real good break in period IMHO. later Robbie
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Old 04-24-2008, 08:39 PM
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Amsoil claims that its products are perfectly good at helping an engine break in properly. Sorry, no link to substantiate that comment.
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Old 04-25-2008, 08:05 AM
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Based on Burt's experiences with rebuilt or new motors in minitrucks, prior to around 10K you can have issues with rings seating properly, and oil consumption, and crappy running. Sure, some motors come from the factory with synth, but they are built to do that. It does not hold across the board. Because Amsoil is a true (and good) synthetic, I would be hesitant to accept their claim for our motors.

I know you had some issues with rings seating, are they fully seated now? Good compression (~165-170)?

In other words, this supports Robbie and I agree with him (which is always a safe position to have!).
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Old 04-25-2008, 08:29 AM
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Originally Posted by Red_Chili View Post
Based on Burt's experiences with rebuilt or new motors in minitrucks, prior to around 10K you can have issues with rings seating properly, and oil consumption, and crappy running. Sure, some motors come from the factory with synth, but they are built to do that. It does not hold across the board. Because Amsoil is a true (and good) synthetic, I would be hesitant to accept their claim for our motors.

I know you had some issues with rings seating, are they fully seated now? Good compression (~165-170)?

In other words, this supports Robbie and I agree with him (which is always a safe position to have!).
What am I chopped liver?
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I need an FJ40....
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  #18  
Old 04-25-2008, 08:40 AM
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You must be on his "ignore list."



I've found that synthetic brake fluid squirts out a leaky brake line just as fast as normal dot3.. and both containers roll under the clutch on descents equally well.
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Old 04-25-2008, 08:43 AM
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What am I chopped liver?
It's what happens when you become known as a speed freak.

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Old 04-25-2008, 09:06 AM
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speed freak
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