David:
Just for info. I use Amsoil synthetic 20/50 in all my LBCs.I change it at
10,000 miles or two years. I have had it analised several times, and have
been told that I could have continued running it. I use it in conjunction
with an amsoil spin on filter, which filters to four microns. Most filters
only go to twent five microns. In my 96 Volvo, I use Amsoil 15/40 Marine
oil with very positive results. Volvo recommends 10,000 miles per change. I
have done 40,000 miles total. It uses NO oil between changes. Analysis
showed that the oil was perfect, with very low contaminants.
The transmissions on the LBCs use Redline MT-90, 75/90.
I was using MTL, but changed to MT-90 in the GT with O/D. Both seem to work
very well.
I am sold on synthetics. For breakin of a fresh engine, I am partial to a
Straight SAE 30 oil, such as Castrol. This is mostly to set the life of the
new cam and lifters. Most cam manufacturers agree with this regime.
Cheers:
Skip.........At 10:37 PM 10/24/97 -0500, Darby wrote:
>Hello Jamey:
>
>Thanks for the note. Castrol does have a loyal following especially in LBC
>and motorcycle circles.
>
>Some of the best recent documentation I've seen of objective testing was in
>an issue of Motorcycle Consumer News. I don't remember the exact issue, but
>seems like it was in June or July of 1996. If you are interested and can't
>find it, drop another note and I will try to locate it for you. They did
>some testing of major brands of motor oil over a fairly long timespan. They
>looked for viscosity breakdown, foaming, and a few other parameters. The
>only lubricant that outscored Castrol 20W/50 was Mobil 1, a synthetic oil.
>
>It is easy for people to form allegiances to particular brands and to
>foster prejudices against others, all without a lot of hard data. I know a
>fellow who religiously runs Quaker State because that's what his father
>used. I am sure you know of other instances. There are lots of excellent
>brands of motor oil, but the important thing for equipment longevity seems
>to be oil and filter change at frequent intervals. For my hardware, I
>change every 3,000 miles or 6 months whichever comes first.
>
>David F. Darby
>White River Valley, Missouri
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