Oils

[symon]

What oils should I use in the engine, gearbox & differential on my ´76 260Z 5 speed. I´ve only had the car a week & I´ve not yet received the worshop manual I´ve ordered.

[Z-point]

you've got a PM!

[Ed]

Depending on how many miles and the climate. But in warm temps a 10-40 or 10-30 will be good for the engine. For the tranny or diff. Use 80W gear oil.

[beandip]

You will most likely get 50 different openions . Here is mine Quaker State or Casterol GTX in either 10w 30 or 10or 20w40 . Depending on the temp and miles on the engine .

[Smokey]

I'll second Castrol GTX 10W-30. Worked very well in my '72. Unless you have a newly rebuilt motor, I would stay away from synthetics to avoid any leaks.

Now lets hear about the tranny, and diff. Come on fellas. Never did open those up on mine.

[symon]

Thanks Guys,
I´ll try the Castrol GTX 10/30 for the motor & 80w for everything else. I´ll report back to say how I get on.

[BillD]

Does anybody have any information about the value of the oils that are advertised as being formulated for high milage engines? I'm curious if this is the newest snake oil additive.

[beandip]

I don't know about the hi milage oils . I , like you think it is just an addvertising thing. I did quite a bit of surching on the web and found a site that went in depth on the componets found in the different brands of oil , they covered about ten different ones. They went into the ash content and all sorts of different things and raited them for different applicatinons. Under load , high RPMs Heat, cold , how they were for forming sludge , all sorts of tests were made. Now I had

been using Quaker state oil for the past 40+ yrs and was pleased to see that it scored in the top two . Quaker and Castrol GTX were almost exactly the same in all reguards and rated the top two. I have since changed to GTX because I can buy it at Cosco , and with four engines to maintain the price brake helps some.

[tanny]

I wonder if they just add a little of that STP honey to regular oil to make those "high mileage oils"? Probably some promotional scam as mentioned above.

[symon]

I´m not expert on oils but I have always put in a quality oil of the type specified buy the manufacturers. At least the Castrol GTX I normally used is well rated on that test, it also has another advantage that when you strip the engine down it is all nice & clean with no gunge.
Here´s my thought on oils for high milage engines : - If the engine has done 100.000s of miles & the oil pressure is down, it burns oil, & make a hell of a noise, no oil is going to solve that. You just got to bite the bullet & strip the engine down & fix it.

[zorro]

I have found Penrite to be really good depending on how much work your engine has done HPR15 is good if it is rebuilt or low on miles where as if it has a slight oil consumption problem HPR 30 is better.....