Synthetic motor oil?

[ZX9RCAM]

The Porsche Manual actually suggests 15,000 between oil changes with Mobil 1......


Not me!

[Texas1911]

Originally Posted by Big country

So If I'm using 5w-30 now that is what I should put in with the synthetic?

Yes. 5w-30 is a good all around weight. It's good on fuel economy and flows well at start-up. A lighter oil should be used in the winter, but I would only be concerned if the motor was using a greater than 40wt. oil, and if I lived in the panhandle where temps are consistently low in the winter.

[Texas1911]

Originally Posted by ZX9RCAM

The Porsche Manual actually suggests 15,000 between oil changes with Mobil 1......

Again, the oil does not wear out. It's just the additives in the oil, like friction modifiers like zinc and moly, that dilute or get salted out, or the increase in particulates. If you have a large filter that is well built then you can easily go 10K - 15K miles on the change.

Porsche knows more about their cars than anyone else. If they stand by 15K changes, then I'd feel comfortable going that far. I probably would change the oil every 7 - 8K instead on my personal vehicle.

On my BMW the filter can be changed out without getting under the car, and without spilling half the oil on the ground. That enables me to go longer on the oil change, since I can change the filter more often.

[Big country]

I'm not to worried about switching in the winter around here with any 5w-30. Do I have to go to the Nissan dealership to get the Nissan oil filter or do they have them at Auto Zone or Oreillys?

[Texas1911]

Originally Posted by Big country

I'm not to worried about switching in the winter around here with any 5w-30. Do I have to go to the Nissan dealership to get the Nissan oil filter or do they have them at Auto Zone or Oreillys?

Unfortunately, Nissan. I just buy like 5 - 6 of them at the same time.

[country_boy]

I was always told never to use synthetic oil in an older vehicle, the gaskets will leak etc. I wouldnt recommend Pennzoil for anything but, for lawn mowers. Mobil one is a very good synthetic as noted and amsoil. The only thing I have a big problem with synthetic oil is spending lots of money. I use Valvoline 20-50w in my truck, ive used it for 6 years without problems.

[Shorts]

Originally Posted by Big country

I'm thinking about making the switch from Castrol or Valvoline 5w-30 to a synthetic motor oil. I will not use Pennzoil and I'm not sure if the two brands I like have a synthetic. I hear Mobil has a good synthetic, but I don't know for sure. Anyway what I want to know is do I use the same wait (5w-30) in synthetic or dose that have to change. And what kind of synthetic do y'all use?

I used Mobil 1 Synthetic and Royal Purple Synthetic and both ran well.

In the gassers I use 10w-30, in the Isuzu diesel & Ducati (dry clutch) 15w-40.

On the Cummins I like Rotella 15w-40

[Texas1911]

Originally Posted by country_boy

I was always told never to use synthetic oil in an older vehicle, the gaskets will leak etc. I wouldnt recommend Pennzoil for anything but, for lawn mowers. Mobil one is a very good synthetic as noted and amsoil. The only thing I have a big problem with synthetic oil is spending lots of money. I use Valvoline 20-50w in my truck, ive used it for 6 years without problems.

Some of the reason is that the regular oil is more viscous than the synthetic. Especially at cooler temperatures. This means it will seep into pores of the gaskets, and sometimes leak. The synthetics today have alot of swell agent in the additive package and this helps to seal the gaskets.

20w50 is an extremely viscous oil. Is the truck rated for this oil, and do you do any towing?

[country_boy]

no just 10 min of driving 5 days a week. Thats what I was told to use by uncle who knows cars for 20 plus years. My truck always seems funny with a lighter weight oil, but i put the heavier weight in her and she runs fine. Wow royal purple oil... I was told to stay clear from that also simply because it cost 6 something a quart.

[Texas1911]

Originally Posted by country_boy

no just 10 min of driving 5 days a week. Thats what I was told to use by uncle who knows cars for 20 plus years. My truck always seems funny with a lighter weight oil, but i put the heavier weight in her and she runs fine. Wow royal purple oil... I was told to stay clear from that also simply because it cost 6 something a quart.

Royal Purple is fine, but it can be a little over-hyped.

Define funny.

20w50 is horrible on start-up wear, and puts alot of strain on the oil pump. It's also going to backfeed alot of oil through the pressure relief valve until it warms up.