Agreed on all points, but one note. Do not start the new engine on
synthetics. Too slick. The rings won't seat properly. Break-in requires a
bit of wear. Use regular mineral based oil for the first 1000 or so.
Especially with old iron blocks.
Larry
On 8/28/01 9:28 AM, "mghirsch" <mghirsch@netzero.net> wrote:
> Synthetic oil is the best you can put in an engine. Blends are still an
> improvement over straight mineral oil.
>
> The only disadvantage to synthetic oils is the cost. Someone told me (and I
> believe it) is if you want 100K out of your engine use regular oil and change
> it every three thousand, if you want 500K do the same with synthetic.
>
> I have a 86 Jag XJ6 with 175K. I use Castrol Synetec, but I know that the car
> has had synthetic since new. Compression and oil pressure is still good, and
> when I change the oil at 3000 it's still clean.
>
> If you were to put synthetic in an older engine, you could have a problem.
> The detergents in synthetic could remove deposits (false seals) and cause
> leaks. Also , if there is a leak, because synthetic has lower surface tension
> than mineral oil, the puddle on the ground looks bigger than that of mineral
> oil.
>
> All in all, synthetic gives better lubrication at all times. There is better
> surface retention so there is less wear on a cold start, and less breakdown
> and deposits.
>
> Just don't follow the early ads and change every 25K.
>
> Maynard Hirsch
> 78b
> 67B
> 86 XJ6
>
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bblmail.psycha.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a question
and you're a fool for the rest of your life.
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