quote:
Originally posted by GeorgeCLS:
Mobil 1/Delvac 1 5W-40 would work fine but really, Mobil 1 MX4T is formulated specifically for your bike engine and would be optimal. Delvac 1 5W-40 is rock solid with respect to viscosity retention...
Delvac 1 has been rock solid in my trucks and since I had it on hand, I wanted to try it in some of my off road bikes since many other oils I’ve tried have sheared down very quickly (both petroleum & synthetic varieties including Amsoil, Maxima, Motorex, Motul, Valvoline, Mobil 15W50 red cap, etc).
This latest sample is from a Honda XR650R off road motorcycle (shared sump) that’s ridden fairly harsh and strictly off road in the western deserts. The oil is changed every 15 hours or less and this sample was based on less than 15 hours of harsh off road use. A new cam was installed ~24 operating hours ago, so perhaps that’s why the aluminum is high since this cam is a machined billet cam and not cast with a hard welded chrome surface like many aftermarket cams. The silver is also high and that concerns me, but I’m keeping an eye on the trend and will tear things down towards the end of this year for a closer inspection. There’s still plenty of AW additives in terms of Z&P, but the boron has been severely depleted which might offer a clue. Viscosity of course has gone down from a 40wt to a 30wt, but this has been very common to most oils I’ve tested so far in this application and the drop in viscosity is similar to the experiences of other off road motorcycle users I’ve talked with who have had their oil analyzed. I plan to try Mobil’s MX4T for a few 15 hour intervals (or perhaps Mobil’s VTwin) and then try something from Schaeffer in due time. Please feel free to share your opinions on this and or offer any input on other oil products to choose from that might hold their viscosity grade better for this type of application.
……………………………Virgin…………...06/02/04
……………………………Mobil……………Mobil
……………………………Delvac 1………Delvac 1
Viscosity………………5W40……………5W40
Aluminum…………………1…………………29
chromium…………………0…………………1
iron……………………….…2…………………24
copper………………….…0…………………13
lead…………………………0…………………3
tin……………………………0…………………0
molybdenum…………….0…………………0
nickel……………………….0…………………0
manganese………………0…………………0
silver…………………..…..0…………………36
titanium……………………0…………………0
potassium…………………0…………………0
boron………………………154………………59
silicon………………………6…………………15
sodium………………………1…………………0
calcium……………………2107……………2428
magnesium………………421………………404
phosphorous……………1090……………1336
zinc…………………………1216……………1378
barium………………………0…………………0
vis SUS @ 210F………76.7.……………65.69 (calculated by me based on cSt numbers below)
Vis cSt @ 40C ………………………………78.2
Vis cSt @ 100C………14.69……………11.80
flash point………………425
Tbn…………………………12.5………………9.6
Viscosity Index………………………………145
Oxid…………………………………………………1
Nitr…………………………………………………1
Fuel…………………………………………………< 1%
Water………………………………………………0%
Glycol………………………………………………Neg