Which 40W? Feedback welcomed

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A10WartHog

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I have a 1991 Nissan 300zx Twinturbo with 51K miles. Vehicle has no performance modifications and is not driven daily. The vehicle is driven easy with 90% of that being highway at speeds of 70 to 80mph.Car is only driven during latter summer/ early fall months. So, cold weather starting is not a major factor here. I live in South Carolina where the vehicle when driven is operated in a temperature range of 85 to 105 degrees F. Owners manual recommends an API SG designation oil with oil viscosity 10w30/10w40. Manual also states 20w40 and 20w50 are usable.

I have been high considering the following with viscosity of 10w40:
1)AMO 10w40
2)Rotella 5W40
3)Mobil 1 HM10W40

Which of these (or any others) would you guys consider?

Also, what your thoughts on running a xxW50 oil?

Thanks
 
I'd seriously consider the 0w-40 by Mobil 1 as well.

But to answer your question regarding your choices, I'd say go with 5w-40 Rotella. I've used it for years and have had nothing but great experiences with it.
 
Another vote for the rotella T6 here. Not only is it going to be the cheapest of the three, it's also a pretty darn good oil in it's own right. Since it's the manual calls for SG (!), it will probably love the additives rotella has.

If the car was modified (bigger turbo, aggressive cams, any kind of work in the crankcase), or was some sort of track car, I'd think about a 50 grade oil, but otherwise I really wouldn't bother
 
Why do people always say Rotella T6 5W-40 is cheaper then Mobil 1? The T6 is $19.50 for one gallon, then you have to buy another quart for over $6.00. The 5 quart jug of Mobil 1 is $24.50 at Wallyworld.

Are you looking for a thin or thick 40 weight?
 
You could also use the Dino Diesel Oils in 15w40 and add a quart or two of synthetic 0w40. Or be creative make up a mix of the Dino Diesel with synthetic from any of the individual Oil Families for a Super Synthetic Blend.

Shell Rotella Triple protection 15w40
Chevron Delo 400 LE 15w40
Mobil Delvac Super 1300, 15w40
Valvoline Super Blue Premium, 15w40
Kendall Synthetic Blend with Titanium, 15w40

The options are there and are up to your choosing. Valvoline Super Blue Premium is $9.99 this month at O'Reilly Auto parts.
 
Rotella T5 15\40,would be my choice of the three you mentioned.Next,That model of the 'Z' is (I think) the greatest of all time,and with only 51k....amazing.
 
A good Motorcycle synthetic 4T (SJ) would slaughter most OTC SM oils. OTW any Eurosyn 5w-40 or M1 0w-40. The 15W HDEO wont help make power in that engine, IME.
 
Ah...an A10 guy with a 300ZX twin turbo...I know an F-14 guy who has the same car...bought with his saved-up tax free pay post - Desert Storm...it has 20K on the odometer...

So, if he were asking me what to put in his baby?

I would go with a synthetic (turbos create lots of heat...this one more than many) in either a 5W40 or a 0W30...and depending on the source, recommend the M1, GC, Edge or PU...

Go check the AAFES...the NEX is selling M1 TDT 5W40 for $1.99 on clearance...that would be the perfect intersection of price, performance and suitability for this sweet car.

Cheers,
 
Originally Posted By: A10WartHog

I have a 1991 Nissan 300zx Twinturbo with 51K miles. Vehicle has no performance modifications and is not driven daily. The vehicle is driven easy with 90% of that being highway at speeds of 70 to 80mph.Car is only driven during latter summer/ early fall months. So, cold weather starting is not a major factor here. I live in South Carolina where the vehicle when driven is operated in a temperature range of 85 to 105 degrees F. Owners manual recommends an API SG designation oil with oil viscosity 10w30/10w40. Manual also states 20w40 and 20w50 are usable.

I have been high considering the following with viscosity of 10w40:
1)AMO 10w40
2)Rotella 5W40
3)Mobil 1 HM10W40

Which of these (or any others) would you guys consider?

Also, what your thoughts on running a xxW50 oil?

Thanks


I would run something with plenty of ZDDP in your application even though it is not driven hard. I would steer clear of SM/SN oils. Royal Purple 10W-40( SL )would be a good choice IMO. Brad Penn oils are another good option for this vehicle IMO.
 
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Thank all for the feedback.

I was considering Royal Purple 10W40, but was not sure of the what the ZDDP levels for this oils were. I am looking for an oil with the "extra anti-wear". Any ideas of what RP 10w40 ZDDP levels are?
 
Originally Posted By: A10WartHog
Thank all for the feedback.

I was considering Royal Purple 10W40, but was not sure of the what the ZDDP levels for this oils were. I am looking for an oil with the "extra anti-wear". Any ideas of what RP 10w40 ZDDP levels are?


I don't know the exact levels but their 10W-40 is API SL so it has plenty in there compared to SM/SN. RP SL oils do a good job protecting old muscle car engines so they should do the job for you I would think.
 
Amsoil AMO is a great oil: the 15w40 AME would also work fine in the twin turbo's.

That's the important characteristic, IMHO.

Cheers!
 
Again, a 10w-40 MOTORCYCLE OIL (SJ) would have high zddp. It would typically exceed API-SJ; forget the photo of the bike on the bottle - you buy oil by Met Specification, not the meaningless vebiage on the oil container. Ignore things like Pictures or of atvs, lawn tractors or snowblowers; ignore unfounded claims (almost any claim), "cleans 35% better than the competitors' oil made from crude tar", exhibits 4x less wear than a gallon of water and beach sand - all absolutely meaningless drivel.
-
Alternatively, for something "weaker" in ZDDP than 4T oil but with more spice than API SM/SN, Most 5w-40 (A3/ API-SL) Euro luxe/supercar oil will have a high specification and a long, impressive approval list. PU 5w-40, M1 0w-40, Pentosin 5w-40, etc.
 
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I think I am leaning higly towards Royal Purple 10W40 after getting the following info from one of their techs.

"This oil contains typical zinc and phosphorus levels of 1,250 to 1,300 ppm each. Royal Purple oils are built on a proprietary blend of synthetic base stocks including Group IV and Group V."

Those ZDDP levels are what I was looking for in a 10W40.
 
The 5/27/2010 Mobil 1 Engine Oils chart showed 0W-40 edging out the HM oils for ZDDP, 5W-40 TDT having higher levels than 0W-40.

VOAs last year on Mobil 1 10W-40 HM, Mobil 1 5W-40 TDT, and Shell Rotella T6 5W-40 showed the HM closely matching the published PDF, TDT lower (probably within any reasonable expectation of blending tolerance), and the T6 with ZDDP levels competitive to the TDT spec.

The end of the T6 VOA thread has a recent update from Caterham with HTHS viscosity and VI specs that he obtained from Shell Canada tech. support.

Unless things have changed radically, neither published specs nor VOA data suggest that any of these oils will get close to Mobil 1 10W-40 Racing 4T or the Royal Purple products for ZDDP content, if that is your most significant concern.

Last year at my WalMart, the Mobil HM oils were the deal, with the 5-quart jug pricing at the same price as a 4-quart jug of T6. That price difference seems to have gone away (although I recon the local store periodically looking for rollbacks). Also last year Shell had a sweetener running with a buy three gallons of T6 get a mail-in rebate for the cost of one gallon coupon. Haven't seen any equivalent rebate (yet) this year.

FWIW
 
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