===== Original Message From Whicher Robert E BATH
<snip Alex> There is strong evidence that 4-stroke diesels burn less oil
with 15w40 than with
a straight grade oil. <snip Alex>
Guru Bob "Lehman" Smith highly recommends the use of straight weight oil in
Ford Lehman's. I'd love to change to a multi weight, but hate the "I Told
you so!"
Any comments?
While I have no doubt that Mr. Smith is the foremost authority on the Lehman
Ford engine, if I had one, I would use 15W40 lube oil in it. I have an
18-yr.-old Perkins, that I think is a very similar engine. I use 15W40 in it.
And, I'm not convinced that it is even thin enough during colder times of the
year. And, if you've got a turbo charger (which I don't) I would think this
could be even more of an issue. That is, getting oil to it as quickly as
possible.
The quicker you get oil to moving parts, the better. And that is going to
happen quicker with a multi-vis lube oil than with a straight weight oil. On
the other end, the multi-weight oil will not thin out as much under high
temperature than a straight weight oil (typically, a 30W oil).
On a slightly different topic. I have a high-tech TDI diesel car. The
manufacturer requires 5W40 synthetic oil to be used. I'm even considering
using a 5W30 or 0W30 in it to get the oil moving even faster. If I eventually
get to go cruising full time one day, I may invest in by-pass filtration and
synthetic oil in my old Perkins so that I can reduce drain frequency. I think
lube oil technology has come a long way since the days of straight weight oil
and I see no reason not to take advantage of it.
My two cents worth. Your mileage may vary...
Mel Knott
Mel Knott
Sandpiper
Chris Craft West Indian 36
Annapolis, MD
>===== Original Message From Whicher Robert E BATH
<WhicherRE@SUPSHIP.NAVY.MIL> =====
> <snip Alex> There is strong evidence that 4-stroke diesels burn less oil
>with 15w40 than with
>a straight grade oil. <snip Alex>
>
>Guru Bob "Lehman" Smith highly recommends the use of straight weight oil in
>Ford Lehman's. I'd love to change to a multi weight, but hate the "I Told
>you so!"
>
>Any comments?
While I have no doubt that Mr. Smith is the foremost authority on the Lehman
Ford engine, if I had one, I would use 15W40 lube oil in it. I have an
18-yr.-old Perkins, that I think is a very similar engine. I use 15W40 in it.
And, I'm not convinced that it is even thin enough during colder times of the
year. And, if you've got a turbo charger (which I don't) I would think this
could be even more of an issue. That is, getting oil to it as quickly as
possible.
The quicker you get oil to moving parts, the better. And that is going to
happen quicker with a multi-vis lube oil than with a straight weight oil. On
the other end, the multi-weight oil will not thin out as much under high
temperature than a straight weight oil (typically, a 30W oil).
On a slightly different topic. I have a high-tech TDI diesel car. The
manufacturer requires 5W40 synthetic oil to be used. I'm even considering
using a 5W30 or 0W30 in it to get the oil moving even faster. If I eventually
get to go cruising full time one day, I may invest in by-pass filtration and
synthetic oil in my old Perkins so that I can reduce drain frequency. I think
lube oil technology has come a long way since the days of straight weight oil
and I see no reason not to take advantage of it.
My two cents worth. Your mileage may vary...
Mel Knott
Mel Knott
Sandpiper
Chris Craft West Indian 36
Annapolis, MD
