It has it ..............calcium.

Ken

The basestock in M-1 V-Twin is amazing with a FP of 518*F.
It's additive package is amazing with ZDDP levels of 1600 ppm. Ouutstanding detergency and it's is built for engines that require long termed stoarage.

Still my favorite for engines that can handle a cst@100*C of 22...it's actually close to a "55" wt oil. Fine for most any offshore application.

I still like Merc's HP gearbox lube...and might give M-1 75W-90 a try.

You were the one who turned me on to V-Twin 20w50. I had cases of it here at work available at no charge, and was using M1 15w50 instead. This was the oil recommended by Innovation/Volvo Penta for my 540/600's. Since I switched to V-Twin, I've noticed significantly more consistent oil pressures. Thank you!

I sent this thread's link to Bill Maxwell. Maybe he'll comment....

For a big-block offshore engine I don't think anything can out do M-1 V-twin. There is enough experience on this board using the product to prove it too.

Does the v twin come in 5 qt jugs at walmart? Nice cheap way to get the 15w50.

Kendall 20w-50

"Kendall GT-1 High Performance Motor Oil is a high-quality engine
oil specially designed for use in gasoline engines operating under
high-temperature or severe driving conditions, as well as in
competition engines and high-performance street engines. It is
formulated to provide excellent wear protection, to minimize the
formation of sludge and varnish, and to resist viscosity and
thermal breakdown even in severe service. It also protects
against rust and bearing corrosion, and has good foam
resistance. The SAE 20W-50 viscosity grade is fortified with
additional zinc dialkyldithiophosphate (ZDDP) additive to provide
enhanced wear protection and oxidation resistance for use in the
most demanding applications. It is particularly recommended for
use in turbocharged engines and in high-performance engines."

Happy, Happy, Joy, Joy!

It's a good oil. However, note that the cst at 100*C is 18 vs. V-Twin M-1 which is 22. If your oil pressures are fine at full temps. stick with it.


GT-1® High Performance Motor Oil
Typical Properties
SAE Grade 10W-40 20W-50
Density, g/cm3 @ 15.6°C (60°F) 0.873 0.883
Density, lbs/gal @ 15.6°C (60°F) 7.27 7.35
Color, ASTM D1500 3.0 3.5
Flash Point (COC), °C (°F) 227 (441) 230 (446)
Pour Point, °C (°F) -33 (-27) -30 (-22)
Viscosity,
cSt @ 40°C 108 175
cSt @ 100°C 15.3 18.6
SUS @ 100°F 559 913
SUS @ 210°F 81.9 94.9
Viscosity Index 150 120
Cold Cranking Viscosity, cP 6,600 6,600
@ (°C) (-25) (-15)
High-Temp/High-Shear Viscosity, cP @ 150°C 3.9 4.8
Sulfated Ash, ASTM D874, wt % 0.94 0.98
Total Base Number (TBN), ASTM D2896 7.8 7.8
Phosphorus, wt % 0.077 0.108
Zinc, wt % 0.085 0.119
1080 ppm of Phos
1190 ppm of Zinc




Compared to Valvoline VR-1 conventional...Zinc-1300ppm Phos 1200


Comapred to M-1 Silver and Goldcap= 1200 ppm Zinc and 1200 ppm Phos

Compare to M-1 V-twin which has 1600 ppm of both Zinc and Phos. ...gotta love overkilll
Compare Redline 1400ppm Zinc and Phos

Most Amsoil Products (V-twin is higher) are around 1150 ppm of zinc and phos

Mobil-1 V-Twin...Kinematic, cSt @ 100°C is really 17.7

V-Twin $11.50/qt
Kendall $3.95/qt

Adds up when I go through 22 qts. and then some for top offs.

If Mobil V-Twin is 22 cST it is not a 50. The max spec for a 50 is 21.89 cST.
They would never overbuild on the viscosity.

Ken

As I re-read this thread...the V-Twin is a good oil, but for the expense I use the Kendall for I change it at 20-25hrs anyway.