D90 oil Type and Viscosity - Defender Source
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  #1  
Old September 10th, 2014, 08:17 PM
crash05
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CJ Szpila
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D90 oil Type and Viscosity

94 D90 with 3.9, what brand and viscosity is the best? What is every one using? 10w30, 10w40??
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  #2  
Old September 10th, 2014, 08:30 PM
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Luis Constantin
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This is a can of worms. Everybody has their favorites.

I use 15/40 in all my cars since it's needed in the diesel and it's ok to use in gas/petrol. That means I just need to buy one weight in bulk, not two or three.

I prefer to use Schaeffer Oil when I can find it. But it's pricey. If not, then I'll use what Costco has in stock. Usually it's Chevron Delo.
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Old September 10th, 2014, 08:41 PM
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This time of the year in NJ 10-30 would probably be better but stand by for 20 different opinions. As for brand, I use Castrol in the gas motors and Shell Rotella in the diesel. As for a reason, it's what the old man used so I just kept buying it.
Castrol owns:
Castrol
Shell
Valvoline
Mobil

I'm not to sure there is any differences between comparable products with different labels.
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  #4  
Old September 10th, 2014, 11:03 PM
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Have a look at your owners manual, it will probably have a chart that will say what oil weight for your climate. For example, 5w30 is only good up to 86F. From what I remember, the ideal weight would be 5w50, but I have only seen it in person once. I always use Rotella 15w40 in my personal vehicles with a Rover V8, and the same when I had a 300 TDI.
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Old September 11th, 2014, 12:20 PM
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Semi-synthetic or conventional?
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  #6  
Old September 11th, 2014, 12:59 PM
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  #7  
Old September 11th, 2014, 01:29 PM
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Luis Constantin
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In the past I've always tried to use synthetic and have never had any issues. I'm using conventional right now due to budget constraints.

There are those that believe the lump of moving metal parts under the hood is designed to use conventional oil only. I think it's hogwash as engines aren't designed around an oil type, just viscosity.

And even the viscosity argument is weak. I know people who run 20/50 and like it. I tried it but found my mpg dropped. Soon as I went back to 15/40, it came back up. But you can do harm to an engine with oil that's too thin for your environment. I would never yes 10/30 or lower, here in Texas.

Truth is for a given weight, almost all oils perform the same under the conditions the mechanical components are subjected to. Oil technology had improved immensely.

Unless an oil that is too thin is used, these engines will never exceed the oil's maximum limits unless left unchanged.
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  #8  
Old September 11th, 2014, 03:23 PM
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I've used both, but I personally just one conventional and change it ever 3k miles.
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  #9  
Old September 11th, 2014, 04:10 PM
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Changed from 10-30 dino to 10-30 synthetic last oil change just because the store had it on sale. Did the oil change and now whenever I park on an upwards facing hill for 30 mins.. go back to start the car and I get valve clatter for the first minute of running or so. I'd stick to dino.
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Old September 11th, 2014, 04:17 PM
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I use the good ol shell rotella 15/40 dino sludge in the V8 in my disco. Tried using the castrol 20/50 and the truck didnt seem to like it as well. Engine ran smoother with less valve/lifter noise with the 15/40.

I ran Liquimoly MoS2 Antifriction Motoroil 20W-50 in my older watercooled VW's with good results. Even after a rebuilt the motor in my Scirocco with the valves adjusted to specs i had a wicked lifter tick with the regular castrol 20/50 or rotella 15/40 The Liqimoly 20/50 quieted it down nicely. Haven't ran it in the rover as my local supplier has had problems getting it in stock.
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  #11  
Old September 13th, 2014, 01:01 PM
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Rotella T6 is a good choice because it seems to quiet the engine and is supposed to be good for flat tappets. I ran it in my 94NAS and I run it now in my 300tdi.
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  #12  
Old September 13th, 2014, 01:30 PM
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5w40 or 0w40 synthetic. Rotella synthetic seems to always be in stock at Walmart.
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