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  #1  
Old January 17th, 2014, 07:57 AM
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Your preferences for synthetic oil viscosity

Well people...I've pulled the trigger and now own a 1997 D90! 76,000 km. Very excited as you can imagine. I am leaning toward synthetic oil and am asking your thoughts on viscosity. 10w40? 5w40? Or what? This will be a three season truck as I kiss her and put her to bed in the wintertime. Thanks for any and all input.
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  #2  
Old January 17th, 2014, 08:15 AM
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The oil you use depends on several factors.

Here's a good link:

http://www.aa1car.com/library/oil_viscosity.htm
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  #3  
Old January 17th, 2014, 08:27 AM
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Whichever weight you end up going with take a look at the BG product line. It is a commitment as they are not cheap and to be effective I believe they require consistency. If you do they warrant engine life assuming the program is started early on. I hear the bigger problems manufacturers are finding these days is stemming from the sub par fuel most of us are now using. Sorry, I got a bit off subject. Good Luck and enjoy your truck often. It'll appreciate it.

Clay
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  #4  
Old January 17th, 2014, 10:23 AM
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10w40 Amsoil, has a nice zinc package. Ive started using a little marvel mystery before an oil change. The Defender really seems to run a little better on shell, RRC is a basket case.
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  #5  
Old January 17th, 2014, 10:44 AM
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Because of the flat lifters, you want something with a lot of zinc in it, unlike most modern oils. Using a diesel engine oil is the easiest way to go.
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  #6  
Old January 17th, 2014, 10:51 AM
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Last oil change, I used 10W40 Rotella in my diesel.
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  #7  
Old January 17th, 2014, 10:56 AM
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Closest thing to a consensus for the rover v8 I've seen is Mobil1 0W-40 (Synthetic) or Rotella T 15W-40 (Dino). Maybe it has changed as of late, but those are what I run in my trucks and am happy.
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  #8  
Old January 17th, 2014, 10:56 AM
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Rotella isnt bad but it doesnt have the zinc it once had. Valvoline VR1 is probably the most readily available oil with an adequate amount of zinc.
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Old January 17th, 2014, 11:04 AM
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Quote:
Originally Posted by rover4x4 View Post
Rotella isnt bad but it doesnt have the zinc it once had. Valvoline VR1 is probably the most readily available oil with an adequate amount of zinc.
I have heard that as well but I haven't been able to find a source. Latest numbers I had were 1200ppm zinc in Rotella T 15W-40 and 1100ppm zinc in Mobil One 0W-40.

Both of those would be adequate for flat tappet, no?

Here's the MobilOne chart: http://www.mobiloil.com/USA-English/...duct_Guide.pdf
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Old January 17th, 2014, 11:16 AM
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I use Brad Penn, made specifically for flat tappets. Supposedly around 1,500 ppm zinc.
Their customer service is also great in case you have any questions.
http://www.penngrade1.com/
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  #11  
Old January 17th, 2014, 11:52 AM
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Thanks for the feedback so far! Seems zinc is absolutely key. Oh, and yes it's a Rover V8 and not a European diesel.
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  #12  
Old January 17th, 2014, 12:00 PM
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I usually use Rotella 15w40 in Rover V8's and in my 300 tdi.
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  #13  
Old January 17th, 2014, 12:03 PM
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My old 3.9 had a weak oil pump. Used 0 or 5-30 in winter just to get that oil pressure light out quickly.
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  #14  
Old January 17th, 2014, 12:39 PM
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Ditto on the comments about zinc--I've preached many times on this forum about the need for the zinc and phosphorus that's been taken out of most oils. I have about 300k on my original engine using only Amsoil or Redline synthetic oil since day one, both of which are loaded with ZDDP (a zinc/phosphorus compound). Royal Purple also has a high ZDDP content. I have heard that Mobil One doesn't have a significant zinc content, but that may have changed--I haven't researched it because I don't use it.

For oil without a high zinc content, there are additives that you can add to the oil--Redline, for example, makes a racing oil additive with ZDDP.

http://www.redlineoil.com/Products.aspx?pcid=1

I can't comment on viscosity--I just use what's in the owner's manual. I have heard about the benefits of 0-40 viscosity (particularly for cold weather starts), which I don't think was available when our Defenders were built, and look forward to comments from some of the experts on this forum.
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  #15  
Old January 17th, 2014, 12:47 PM
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Amsoil
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  #16  
Old January 17th, 2014, 12:54 PM
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I'm always reluctant to join in on an oil discussion, but...

You can't necessarily just focus on zinc (Zn) and phosphorus (P) levels. Zn and P levels are typically high in diesel oils because these oils usually have higher detergent levels, requiring higher Zn and P to offset the negative effects of detergents on lubrication. So, diesel oils aren't necessarily any better than regular oils with lower Zn and P levels.

Also, high phosphorus levels can be detrimental to catalytic converters, and excessive ZDDP levels reportedly attack grain boundaries in iron resulting in spalling, so you don't want to get too crazy with ZDDP levels. I know, it's easier to replace a cat than rebuild an engine, but don't fall victim to the "more is better" trap.

(BTW, I have a 68 Camaro with a L30 327 flat-tappet engine.)
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  #17  
Old January 17th, 2014, 01:13 PM
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I've run 5-50 castrol syntec since 1997. No issues.
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  #18  
Old January 17th, 2014, 01:17 PM
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Yes, I should have mentioned the effect on catalytic converters--that's the reason for the reduction in zinc/phosphorus content in the first place. Don't overdo it and add ZDDP to Amsoil, for example. But unless the car is burning lots of oil, the long-term effect on the cats is, at least to this retired economist, a fair tradeoff. Even with a steady diet of Amsoil, my cats lasted until they were replaced along with a clutch change at 290k. And the engine keeps purring on...
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  #19  
Old January 17th, 2014, 01:49 PM
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the guy that rebuilt the 4.2 in the old bosses LWB says Vr1 at a minimum for the flat tappet. the guy is an engine masters shootout winner so IDK.
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  #20  
Old January 17th, 2014, 02:16 PM
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Quote:
Originally Posted by rover4x4 View Post
the guy that rebuilt the 4.2 in the old bosses LWB says Vr1 at a minimum for the flat tappet. the guy is an engine masters shootout winner so IDK.
Many engine builders suggest different oils for break-in versus normal operation, especially for flat tappets.
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