Should I change my transmission oil?

[JFP in PA]

Originally Posted by ty_wheels

Thanks JFP. I hear that comment about Porsche's recommendations quite often

It is not clear when to replace what, except that I saw in many posts to replace the oil every 5k miles.

So, would be very beneficial to 986 owners to have 1 sticky post that will state how often to change all the major items.

What do you think ?

I think it would precipitate another oil argument...........

Realistically, how and how much the vehicle is used plays into this; tracked cars and daily drivers need more attention than weekend toys. That said, in general, I would use the following:

• Coolant every five years, or when is shows signs of degradation (pH, freeze level, etc.)

• Engine oil and filter every 5 K miles
• Manual gear box every 30-40 K miles
• Tip fluid and filter every 40-50 K miles

And remembering to use the correct fluids, such as an engine oil with high film strength and ZDDP levels.

[ty_wheels]

so you could do it for 2 categories / classes - daily used and weekend used.

arguments can be healthy, innovation is derives from that :-)

[JFP in PA]

Originally Posted by ty_wheels

so you could do it for 2 categories / classes - daily used and weekend used.

arguments can be healthy, innovation is derives from that :-)

Gear box oil and coolant suggestions would remain the same. Non weekend toys, I would invest in collecting some UoA's across miles; when the TBN values drop to 50% of that of fresh oil, it is time to change the oil. If you were to compare TBN values across multiple cars, you would find the decline rate would vary dramatically, based upon real world usage. But once the TBN (total base number, or the remaining active additive package in the oil) hits that 50% threshold, it is time to change it based upon your actual usage.

Simple.................

[BYprodriver]

Originally Posted by ty_wheels

so you could do it for 2 categories / classes - daily used and weekend used.

arguments can be healthy, innovation is derives from that :-)

Yes but rarely in oil debates.