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Toolfań
Dodge Dakota
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12/22/2005
17:41:38
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 Subject: Oil help!
IP: Logged
Message:
What can happen if I use 10w40 oil when it says to use 10w30 oil?
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toolfan
GenIII
12/22/2005
18:20:03
| RE: Oil help!
IP: Logged
Message:
your fine
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cook393
Dodge Dakota
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12/22/2005
18:23:52
| RE: Oil help!
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Message:
ya, i run 10w 40 in the summer, 10w 30 in the winters here in ohio
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AmsoilSponsor
DakotaEnthusiast
12/23/2005
09:31:26
|  RE: Oil help!
IP: Logged
Message:
Toolfań,
Questions: Vehicle? Age? Condition? Climate?
First, determine the age and condition of the engine/seals/etc. Second, determine where you live (Winter / Summer extreme temperatures).
The first number in a viscosity rating (viscosity grade actually) indicates cold start viscsity and both are a "10w-". If you live in an extreme winter climate, you might want to consider a "5w-" or a "0w-" oil for improved cold starts.
The second # ("-40") is the warm (operating temperature) viscosity grade (approx. 10 minutes after starting). Why are you considering a "thicker" 40 wt. oil vs a "thinner" 30 wt oil?. Are you seeking higher oil pressure readings for some reason? Are you considering a thicker oil because the seals are leaking? A 10w-40 is a "10w-" when cold and a "40 wt." when it hits operating temperature (approximately 10 minutes after stating).
Also, a 10w-40 will rob you of gasoline mileage ... typically 2% - 3% less MPG ... than a 10w-30. Also keep in mind that a higher viscosity can translate to a greater load on the pumping system, and pumping losses through the passages, bearings, and even the filter. Theoretically, that results in less power and lower fuel efficiency (lower MPG).
A healthy (well maintained) engine, still within tolerance, can maintain sufficient oil film strength with "lower viscosity fluids" vs. "higher viscosity fluids" ... which has many more advantages than switching to a heavier weight oil.
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Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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Toolfań
Dodge Dakota
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12/23/2005
22:45:01
| RE: Oil help!
IP: Logged
Message:
10w40 was all that was laying around and I was low on oil...
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Jecht
Dodge Dakota
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12/23/2005
22:53:18
| RE: Oil help!
IP: Logged
Message:
if you just used it to top off a low oil level. its ok and wont hurt nothing. I wouldnt use a 40 weight oil as an oil change unless its a high mileage engine. as the oil may not flow well in certain areas of the passages and might starve the engine some on oil.
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