Patman : Rotella T 5w-40 ?

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553
Location
USA
Hi I have been running M1 10w-30 in my 97 Olds LSS with the L36 3800. I am intrigued by the Rotella T 5w-40. Is this oil ok for my 3800, and does it make sense to replace the M1 with it ? Thanks to you and all others who respond.
 

Patman

Staff member
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22,012
Location
Guelph, Ontario
I think it would probably work well in that engine, which is an older design and most likely has looser clearances. Be sure to do a UOA on it so we can see the comparison to M1.
 
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9,365
Location
USA
anyone got specs for this oil? Please post. there is plenty of this oil at walmart for $12.83 a gallon. I was thinking this could be the perfect year round oil for me and to decrease my bearing wear. I was also thinking about the 15w-40 pennzoil long life they have for 5.77 a gallon but running in the winter... [I dont know] 92 mits mirage 116k miles, dino entire life
 

lght1

Thread starter
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553
Location
USA
hi i was just a little concerned about the 5w-40 oil in an engine that calls for 10w-30/5w-30. with its diesel detergents, should keep my engine super clean dont you think?
 
Messages
137
Location
los angeles
quote:
Originally posted by lght1: hi i was just a little concerned about the 5w-40 oil in an engine that calls for 10w-30/5w-30. with its diesel detergents, should keep my engine super clean dont you think?
Regular changes will also help keep your engine clean.
 
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173
Location
Iowa
lght, its going to be the next step for my 94 Regal with the 3800, assuming I see an improvement in oil pressure using Havoline hi-mi forumla which is significantly thicker than Hav. syn.
 
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2,768
Location
Tn
Mobil 1 is rated B5-02 and CF, so I think detergency and TBN retention are going to be exceptionally good. I would not expect the Rotella to clean any better nor would I run it for an extended oci. I'm not sure we gain anything here by switching. My 3.8 doesn't seem to require anything thicker than M1 10W-30, but perhaps your's might. Only way to know is to compare uoa's and use general impressions as to how each one runs.
 
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4,872
Location
MN
someone just posted a great UOA with M1 10w30. I'm not sure why you'd go to a group III. Patman, the 3800 went through a complete overhaul in 95/96, when it became the "series II. This included short skirt pistons, micro finished crankshaft, low tension piston rings, and other high tech features. I don't think the clearances are any looser than most modern engines. -T
 
Messages
173
Location
Iowa
quote:
the 3800 went through a complete overhaul in 95/96, when it became the "series II. This included short skirt pistons... -T [/QB]
Boo. Booooo. To **** with the short piston skirts and the piston slap they cause.
quote:
My 3.8 doesn't seem to require anything thicker than M1 10W-30, but perhaps your's might.
M1 10w30 in my 3800 = tick tick ticky ticky tick tick tick from the engine audible from a good 8ft away. Switching to Havoline syn 10w30 cut the volume of the ticking drastically, to the point that I cannot even hear it anymore unless the hood is up and I listen closely.
 
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4,872
Location
MN
quote:
Originally posted by Forkman:
quote:
the 3800 went through a complete overhaul in 95/96, when it became the "series II. This included short skirt pistons... -T

Boo. Booooo. To **** with the short piston skirts and the piston slap they cause.
quote:
My 3.8 doesn't seem to require anything thicker than M1 10W-30, but perhaps your's might.
M1 10w30 in my 3800 = tick tick ticky ticky tick tick tick from the engine audible from a good 8ft away. Switching to Havoline syn 10w30 cut the volume of the ticking drastically, to the point that I cannot even hear it anymore unless the hood is up and I listen closely. [/QB]
Never heard any piston slap out of a 3800. All my 3.8s have run M1 10w30, my dad uses Supertech in his. [I dont know] -T
 
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2,768
Location
Tn
Hmmm Forkman, I don't think this is common with the 3.8 engine. I once tried the Havoline Syn and I have run Mobil Blend, GTX, Syntec, and M1. There was no noise like you describe with any of these. All were 10W-30. It's maybe at it's quietest with Syntec (which is even thinner than M1), so... [I dont know] Mine anyway doesn't seem to need more viscosity to quiet things, nor does it consume M1.
 
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22,187
Location
Colorado Springs
I recently ran Rotella 5w-40 in my Moms Olds 88, 3800 V-6. It made the lifter tick slightly louder, but other than that, it ran great. Consumption was down a bit, and it turned nasty dark after only about 2,000 miles, so it was obviously cleaning. It also started way easier with the Rotella compared to the dealers bulk 10w-30 in below 0 weather.
 
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9,365
Location
USA
quote:
Originally posted by Drew99GT: I recently ran Rotella 5w-40 in my Moms Olds 88, 3800 V-6. It made the lifter tick slightly louder, but other than that, it ran great. Consumption was down a bit, and it turned nasty dark after only about 2,000 miles, so it was obviously cleaning. It also started way easier with the Rotella compared to the dealers bulk 10w-30 in below 0 weather.
so your mom's old had dino it's entire life? then u switched to rotella t syn and there were no leaks? no auto-rx?
 

KW

Messages
1,686
Location
Central Arkansas
quote:
Originally posted by blsnelling: Is this Rotella Synthetic friction modified?
Nope not at all. It's just good ol group III oil. I really like the stuff. [Smile]
 
Messages
22,187
Location
Colorado Springs
quote:
Originally posted by Cutehumor:
quote:
Originally posted by Drew99GT: I recently ran Rotella 5w-40 in my Moms Olds 88, 3800 V-6. It made the lifter tick slightly louder, but other than that, it ran great. Consumption was down a bit, and it turned nasty dark after only about 2,000 miles, so it was obviously cleaning. It also started way easier with the Rotella compared to the dealers bulk 10w-30 in below 0 weather.
so your mom's old had dino it's entire life? then u switched to rotella t syn and there were no leaks? no auto-rx?

No leaks what-so-ever. After 2,000 miles, I did start the cleaning phase of Auto-RX with the Rotella for an additional 1500 miles, and it was like black tar coming out when I drained it! Motor is now spotless through the oil fill on the front valve cover. It was prett clean to begin with though.
 
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