Original message
| geroge douglas
|  "Would you make the change on older RV?"
, posted Tue 23 Oct 20:08 
George
I have just received your catalog of Amsoil products. I have read a few
] good articles recommending Amsoil in different RV magazines. I own a
] 1985 Southwind class A with a chevy 454. It has high mileage, a little
] over 110,000 miles on it, but it still runs strong. I purchased it three
] years ago and only put a couple thousand miles on it since. My question
] is whether or not it is worth switching over to synthetic oil now with
] already high miles on it. I've read varying opinions on this matter.
] It burns very little oil now, the compression is very good, so I suspect
] the engine is still in decent shape.
]
] I have two other vehicles that I wish to use your products in, one of
] which also has high mileage, over 125,000 miles. With your experience
] that you stated in your letter, I will be very interested in getting your
] opinion in this matter.
]
] I have also heard that automobile manufacturers don't recommend using
] synthetics in new vehicles because the rings won't seat properly. Is
] this true?
]
] One last question, if I decide to use your products in my older vehicles,
] would it be worth the investment to install the by-pass oil filter
] system?
]
] Thank you again for the information and I look forward to your feedback
] on these matters.
]
] Dan Dan,
I would use the Amsoil 20w50 synthetic oil in your 454, even though your
owners manual will recommend a 10w30 oil. When this engine was new it would
normally burn a quart of oil every 1500 miles in a RV. I have some
customers with RV's just like yours and they are having good results with
our oil. I don't normally recommend a thicker oil than what the manufacture
says to use, but in RV's with the 454 I do. For your other questions, it is best to let an engine break in for a few
thousand miles before changing over to a synthetic. Some new engines come
from the factory with synthetic oil in the crankcase though and have no
problems breaking in. Now when making the change over in an older motor I
recommend changing the oil filter after a couple thousand miles to make sure
the filter doesn't fill up and start by-passing all the dirty oil through
the motor. You have to remember that the older engine will most likely have
residual petroleum deposits still in the engine and with a new synthetic oil
in the crankcase, it will carry these deposits to the filter. Now the
by-pass oil filter is a great add on assembly with many benefits. You have
to decide what you want out of it and then make a decision. Let me know
what you want and think it can do for you and I will help guide you on your
decision. On your RV I would install one for a variety of reasons. One
would put less stress on the oil due to it adding to the total capacity of
the crankcase and lowering the oil temp and another would be to cut down on
oil changes. It's a lot easier and cheaper to change filters instead of
oil. Let me know what other info you need. George
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