Hydrocruiser ??????? oil related
 

i have a twin 496 ho motor's 2005's with 250 hour's on them i was thinking of changing to amsoil 15-40 marine oil " also for deisal motor's "
would you think this will be ok with the motor's having 250 hour's on them already . 80 % of my boating is at idail "1000 rpm and then at cruise at about 3700 rpm .
i used to use the 20-50 racing oil in my old boat with 600 inch motor i would think that mite be to much for the 496ho motor's .
i also dont want to change oil as often that's why i thought the 15-40 marine deasil oil would be a good one a lot of additive's

thank's
mike

The 15W-40 has an API rating of SL/SJ if I recall the ZDDP level is around 1400ppm it's a good choice.

M-1 Silver and GoldCap have a ZDDP level of 1200 ppm

M-1 V-Twin 20W-50 have a ZDDP level of 1600 PPM

Redline 20W-50 HP oil is at 1400 PPM

Amsoil 20W-50 ZDDP is I think 1200 ppm

Valvolione VR1 Conventional oil is at 1400 ppm


all good oils..

Yes you can get on board with a synthetic now. I would lean towards a 15W-50 or 20W-50 as the engine has loosened up with 250 hours on them.

Thank's for your help :)
mike

Wait until you see what Amsoil is coming out with soon. Trust me it is worth the wait.

well give us a clue :)

Ok Ok

3 new weights and lots of the good stuff in the mix. Think Zinc. :evilb:

Offshore motors need 1200-1600 ppm of Zinc/Phos. Sometimes adding a good does of moly decreeases the nned for ZDDP.
(That's what Volvo and Merc have always had in their oils).

Currently "automotive" oil has 800 PPM...simply not enough

Lubrizol and others are trying to come up with a new product to get the ZDDP out.
http://www.lubrizol.com/

They need a Series 3000 (very high PAO content oil base-stock) with a ZDDP concentration of 1600 ppm and a weight of 30/40 and 50.

When they cutb ack from Series 3000 to series 2000 the base stock was reduced. Grp iv to a Grp III as I recall.

I use the Series 2000 Racing 20w-50 in my HO's. Its not too much, trust me. The 15w-40 will work, but I would say use the 20w-50.

All AMSOIL is Group IV except the XL series, which is a blend. They've only had one only that is called a Series 3000, which is the HDD 5w-30 Diesel Oil. Base stock was never reduced and has always been an extremely good product.