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cub 1947 said:388,00 miles on original engine and transmission, have changed 3! valve shims,without sludge;consumption is a qt. every 700 miles, mainly valve seals and leaks. Engine has had 10w40 winter, and 20w50 summer, Castro Syntec blend every 3,000 miles. Transmission has Redline ATX still shifts well. Enjoy your 30w, $7 oil, 15k changesand changing your rod bearings and oil pumps.
38,800 miles and your valve seals are dry hard and leaking? must smoke alot at startup and when you are heavy on the throttle.
If I was mistaken at 38k then maybe 388k is what you meant to type in. lets analize your stab at the $7 a quart users.
Hmmm its obvious you dont run your sho hard cause you never made a claim you needed rod bearings at 388k
So you use castro syn and you spend maybe $2 a quart? really dont know dont buy the stuff, anyway at 388k if you owned it from new like you lead on you have changed the oil 129 times.
that cost around lets say $14 each time at 129 times it would cost $1806
lets not forget the quart every 700 miles, lets be fair and cut the miles in half from 388k, so at 194k you started using a quart every 700 miles, so that would be 4 quarts every 3k so add $8 to $14=$22.
now lets divide 129 oil changes in half 64.5
and add in the internal and external leaking engine oil that it consumes
wich would add $516 to $1806 and add up to $2322 spent on cheap oil.
ok now lets play fair, a well kept SHO engine using Amsoil from new to 388k would have had 15 oil changes, cost per oil change $64 thats 2 gallons $22 each and 2 filters $10 each, that would cost $960 with 3 extra quarts each purchase.
Now to understand the advantage is not only the price but you say no sludge? its thats whats visible? have you taken out the pistons and inspected the rings? Ill bet there is a buildup of burnt oil all around the rings and thats where you high oil compsumption is coming from, you also said valve seals, all hard and brittle?
most Amsoil engines dont leak oil and have the ability to keep the rubber and viton seals within the engine in new condition, not to mention the wear is considerablly far less than with conventional oil. :corn:
well you keep driving slow and stopping alot to crawl under ur car to put cheap oil in your car
Javier
and changing your rod bearings and oil pumps.

Amsoil has a good reputation but why is it so much better than the rest?