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Old 30-10-2020, 08:53   #46
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Re: Marine grade or regular oil for old diesel?

1984 Westerbeke 115 HP - 6. I use non synthetic diesel rated oil, mostly Rotil A in straight grades. We added a 1 micron bypass filter and now only change oil if we note a viscosity (pressure) drop. Find several filters with a Google search - bypass oil filter kit

Oil goes from any spare port or T on the oil pressure rail after the pump to the bypass filter and returns to the sump. The filter has a small orifice to control the flow and maintain proper pressure on the oil rail. Change the bypass element, not the oil, add a quart instead of a full oil change. Your engine has a small sump. Mine is three gallons. Keeping the oil filtered to 1 micron will go a long way to cut wear.
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Old 30-10-2020, 08:55   #47
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Re: Marine grade or regular oil for old diesel?

I've been using Rotella T4 in my Perkins 4-108 for over 30 years with no problems. Highly recommended for diesel engines.
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Old 30-10-2020, 10:09   #48
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by marth View Post
I was just wondering what you guys use in the old diesel engines? I've got a Yanmar 8hp from 1979. I was checking the prices and the inboard mineral oil started from 40eur/5l whereas regular mineral oil 15w40 was 12eur.

Asked my mechanic, he basically told me the price difference is the boat picture on the can. Asked the guy from the lubricant shop who couldn't think of a reason to go with this more expensive one (it was an automotive store).

Is there really a difference?
I've been Mobile diesel synthetic 5/30 for about 5 years now on an '83 engine, no issues.
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Old 30-10-2020, 10:32   #49
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Re: Marine grade or regular oil for old diesel?

Though both automotive and marine grade oils are able to lubricate an engine, it is not completely true to say that there are no differences between the two.
I attach a couple of links where you can read about this issue:

https://itstillruns.com/tar-oil-off-car-5880920.html

http://goqcrew.com/is-it-ok-to-use-automotive-engine-oil-in-a-marine-engine/
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Old 30-10-2020, 14:52   #50
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Re: Marine grade or regular oil for old diesel?

Older diesela will thrive on older oils I run a 15w monograde in my 60 year old gardner big advantage can also ise the same oli in the gearbox. Using a modern oil wth its detergents and additives would have released all the sludge hidden in the motor not in a good way
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Old 30-10-2020, 14:56   #51
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Re: Marine grade or regular oil for old diesel?

Rotella T4 is the boss.
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Old 30-10-2020, 18:25   #52
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by Tayana42 View Post
My Yanmar 4JHE is from 1989 but a bit bigger than yours at 44hp. I use Delo400 LE 15w40 non detergent oil 6qts.
Same, great oil for our Bukh 24.
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Old 30-10-2020, 19:00   #53
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Re: Marine grade or regular oil for old diesel?

You may note that Diesel engines usually specify CC-HD (I think that stands for Compression Combustion Heavy Duty) grade motor oil. The service load of a diesel in marine use is not materially different than that of the same engine (most marine diesels being marinized versions of general purpose engines for construction equipment, pumps, generators, etc. ) used for non-marine purposes. Any oil marketed as ďmarine gradeĒ is likely a marketing ploy. Stick with the manufacturersí recommendation.
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Old 30-10-2020, 20:48   #54
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by marth View Post
I was just wondering what you guys use in the old diesel engines? I've got a Yanmar 8hp from 1979. I was checking the prices and the inboard mineral oil started from 40eur/5l whereas regular mineral oil 15w40 was 12eur.

Asked my mechanic, he basically told me the price difference is the boat picture on the can. Asked the guy from the lubricant shop who couldn't think of a reason to go with this more expensive one (it was an automotive store).

Is there really a difference?
Mobil Delvac 1300 blended. Cheap and excellent reviews.
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Old 30-10-2020, 22:16   #55
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by dennismenace111 View Post
No one uses Shell Rotella T4? It seems to work great for my 1987 2GM20F.
Itís the only oil I use...... For engine and trans. Also use rotella coolant for engine. Great products.
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Old 30-10-2020, 23:15   #56
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Re: Marine grade or regular oil for old diesel?

A word of warning. Look carefully at all the info on a container of "tractor oil" it frequently refers to the oil used in the older style tractors that was both the lubricant for the transmission, differential, and as the hydraulic fluid. It is not suitable for engines. It probably would work for awhile, but does not contain the soot holding properties and additives to deal with engine heat, etc. Any reputable diesel rated oil of the proper viscosity is usually fine in an older engine. I use Delo 400, LE, 15/40. I have had knowledgeable people tell me the old Perkins should not have a multi weight, but I have been using it since 1983 for a lot of hours...Rebuilt one at over 20,000 hours and has another 12,000 since. Make sure its diesel rated, and change as needed. I frequently run double the hours between changes, when on a passage. If you see oil pressure beginning to rise, change the filter immediately, even if low hours, soot could be plugging it.
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Old 31-10-2020, 05:28   #57
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Re: Marine grade or regular oil for old diesel?

Do anyone here have actual info about the effects of running new oil in old engines? There is a lot of opinion but if someone posted some actual study or something I missed it.

Has someone actually had an older engine fail that was attributed to switching to new oil?
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Old 31-10-2020, 06:39   #58
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by dennismenace111 View Post
No one uses Shell Rotella T4? It seems to work great for my 1987 2GM20F.
Would that be the same as heavy duty 'off road/diesel' from Rotella?
Use it in my '82 2gm. I'm happy with it, been using it for 20 yrs in same boat.
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Old 31-10-2020, 06:43   #59
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by hpeer View Post
Do anyone here have actual info about the effects of running new oil in old engines? There is a lot of opinion but if someone posted some actual study or something I missed it.

Has someone actually had an older engine fail that was attributed to switching to new oil?
I know it's not quite on topic but ...
Only thing I can think of was an Evinrude mech said I could use the "new" 50 to 1 in my (really) old outboard motor. Nope, fragged it in about 4 hrs.
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Old 31-10-2020, 10:36   #60
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Re: Marine grade or regular oil for old diesel?

Quote:
Originally Posted by puffcard View Post
Rotella T4 is the boss.
I'm 77 and Pop told me to use Rotella T.
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