castrol gtx 10-40 engine oil

mtbspeedfreak wrote: I use Amsoil 10w-40 exclusively. I ride year round, sometimes it's 110, sometimes it's 30. I also get my oil chemically analyzed every other change.

Oil is the lifeblood of these bikes.

Roughly, what is the cost of the chemical analysis? Ed

650ed wrote:

mtbspeedfreak wrote: I use Amsoil 10w-40 exclusively. I ride year round, sometimes it's 110, sometimes it's 30. I also get my oil chemically analyzed every other change.

Oil is the lifeblood of these bikes.

Roughly, what is the cost of the chemical analysis? Ed

$25 a pop: www.blackstone-labs.com/tests-price-list.php

I have to hurry to break 45k miles because I forgot to collect a sample at 40k.

Thanks!!

Old Man Rock wrote:

So basically you're saying that Mobile 1 comes from high dinosaur shit? :lol:

I was just considering using some Mobil Delvac 1300 15w-40 oil in an'83 1100. MFolks list of good conventional oils all seem to be like the Delvac, oils for diesels. I was wondering about the additives in such oil. I have in the past always used Valvoline 10w-40 and on occasion during peak heat months used straight 40 or 50wt Valvoline racing oil.
I've never forked out the bucks for something like Royal Purple, but It might be worth it sometime.

If the container is marked JASO-MA it is ok to use, but I do not think the Delvac is JASO-MA certified. I would not use it in a KZ. There are plenty of oils that meet the spec, so pick one of those. Ed

Read:

www.oilspecifications.org/jaso.php

4TheKZ1000 wrote: it might be my 40th choice...leave it for john force to use.

He changes his oil every 1/4 mile or 3 seconds whichever comes first! :woohoo:

mtbspeedfreak wrote:

Old Man Rock wrote:

So basically you're saying that Mobile 1 comes from high dinosaur shit? :lol:

You missed that part on the bottle where it says fully synthetic,no dino crap was hurt in the making of that oil! :woohoo:

I don't know about you guys but i was told NEVER to use synthetic motor oil for these older bikes because it eats up the clutch plates. I was told by multiple reputable sources DO NOT USE SYNTHETIC OIL unless you have a new modern clutch. I was also told to use Castrol 10w-40 4t non synthetic which meets JASO MA. You can nit pick the small stuf or you can stick with what works.

Ive been a fan of golden spectro synthetic since early 80s,never had a problem with it in wet clutch motors.
i dont pay much attention to all the little letters makes my head hurt,i just use what works for me

built408 wrote: I don't know about you guys but i was told NEVER to use synthetic motor oil for these older bikes because it eats up the clutch plates. I was told by multiple reputable sources DO NOT USE SYNTHETIC OIL unless you have a new modern clutch. I was also told to use Castrol 10w-40 4t non synthetic which meets JASO MA. You can nit pick the small stuf or you can stick with what works.

Synthetic works GREAT in these bikes! I've been using it for 6 years. BUT it MUST be JASO-MA certified, such as Mobil-1 Racing 4T. So, if for example you use plain old Mobil-1 CAR oil you are asking for trouble. I also agree that Castrol 10w-40 4t is a very good choice for KZ bikes. Ed

One of many urban myths about synthetic: causes engine leaks, won't let your engine break in, won't mix with regular oil, can't use it in old engines.

All crap. Amsoil syn is just about the best bike oil there is.

The thing that ruins bike clutches is the "friction reducing additives" junk the oil makers throw in (molybdendum disulphide) to try to con people into thinking it "replaces" the ZDDP they took out.