What viscosity oil should I run in the winter? - Defender Source
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  #1  
Old December 22nd, 2008, 12:22 PM
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Wade Garrett
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What viscosity oil should I run in the winter?

it is damn cold here in NY now & I have been using 10w-30. Should I stick with this?
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  #2  
Old December 22nd, 2008, 12:34 PM
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0w 40 mobil one synthetic.
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  #3  
Old December 22nd, 2008, 04:54 PM
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I agree...
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Old December 9th, 2009, 04:31 PM
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Todd Miller
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I have been using 15/40 rotella. Will changing to a 5/30 or 5/40 make for better winter start up? Also what about switching from 15/40 dino oil to syhthetic? my engine mileage is unknown are there any ill affects of changinig to synthetic? what about just switching for the winter months then back to normal 15/40?
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Old December 9th, 2009, 04:34 PM
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Rich Campbell
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I was running 10/30 regular oil for 130k.....I switched to Mobile one syn 10/30 and I swear my truck started tapping much louder at start.....also more smoke at start.....switched back and it improved....

I was thinking of trying 0/40 as Ron suggest but am a little worried it could cause problems.
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Old December 9th, 2009, 04:54 PM
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Guess I should clarify my Disco is a 300tdi.
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  #7  
Old December 9th, 2009, 05:17 PM
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5w 40 rotella synthetic.

Follow-up Post:

Quote:
Originally Posted by Campbell
I was running 10/30 regular oil for 130k.....I switched to Mobile one syn 10/30 and I swear my truck started tapping much louder at start.....also more smoke at start.....switched back and it improved....

I was thinking of trying 0/40 as Ron suggest but am a little worried it could cause problems.
If it is hosed, it is hosed and the oil can only expose problems that exist.

For your truck Rich, I would clean out the pick-up in the pan (ought to do cross seals at the same time) and see if it is blocked up. Also do a PCV service and make sure all the hoses are new or good in that. GEMS tend to gunk up worse than the earlier motors. At least pull the valve covers and see how gunked up it is.
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Old December 9th, 2009, 05:33 PM
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Rich Campbell
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Quote:
Originally Posted by evilfij
5w 40 rotella synthetic.

Follow-up Post:



If it is hosed, it is hosed and the oil can only expose problems that exist.

For your truck Rich, I would clean out the pick-up in the pan (ought to do cross seals at the same time) and see if it is blocked up. Also do a PCV service and make sure all the hoses are new or good in that. GEMS tend to gunk up worse than the earlier motors. At least pull the valve covers and see how gunked up it is.
Thanks Ron,
That's what I plan to do....the PO was INSANE with the service on my 90. I have a stack from day1......did every service at the dealer up until I bought it.....he was the original owner. Oil changed every 3k so I would be surprised if it is gunked up......but I guess I will see soon enough. PCV is next on my list.
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  #9  
Old December 9th, 2009, 07:58 PM
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...that's good news the oil was changed every 3k...
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  #10  
Old December 9th, 2009, 08:25 PM
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Rich Campbell
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Oil

I have heard a few guys here in the ne and up in Maine run 5w/40 in the winter with good results.
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  #11  
Old December 9th, 2009, 08:57 PM
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switched to 0-40 mobile synt. frum 10-40 synth. Running pretty smooth..
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  #12  
Old December 9th, 2009, 09:41 PM
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Bill Adams
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You don't REALLY need a lower viscosity unless the temperature is below 0F for prolonged periods. Multi viscosity oils like 10w-30 and 5w-30 etc are configured to work over a very wide range. They act like 30w when they are cold and when the engine heats up the viscosity lowers to 10w or 5w or whatever. If you do a search on Google you'll find detailed explanations of this and what temp ranges oils work well in.
Just because you feel cold doesn't mean your engine thinks so too. Synthetics are overhyped. Dinosaur oil is more than adequate for your truck.
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Old December 10th, 2009, 12:33 PM
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Quote:
Originally Posted by Campbell
I was running 10/30 regular oil for 130k...
If you have 130k miles on your motor, you are doing something right. If it's not broken, don't fix it...keep using the same oil that brought you 130k miles and change it every 3k.

If you are still questioning what oil to use, refer to your owners/shop manual. Use those lubrication specifications. Also, call around to local Rover shops and LR Dealerships. Find out what they are using, that's what I did and found all used the same weight of oil as the owners/shop manual prescribes. As for the synthetic vs. dino and the "zink/high temp high shear" debate...that's been beat to death, however I would like to mention that if there was a problem with today's oil performance with flat-tappet cams due to low levels of ZDDP, Rover would address it. There are many flat-tappet Rover motors (up to 2004) on the road today using oil that is recommended by Rover. I'm not bashing anyone for using synthetic or diesel oil, it's preference.

Cheers...
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