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Old 11-19-2008, 04:43 PM   #1 (permalink)
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what kind of engine oil is best for my hemi? (Moved)

what is the best engine oil toput in my 05 300c hemi??
i put regular oil because thats what the dealer told me to put, and also what kind of gas is the best for the 5.7 hemi??
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Old 11-19-2008, 05:02 PM   #2 (permalink)
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Lots of people here use synthetic, Mobile 1 etc. On the other hand, under normal use, the 5.7 is not going to be stressed so normal 5W-20 should be fine.
For gas, just use 89 octane as per the manual, or if you are into saving pennies you can use 87 but the motor may pull timing and give a little less power.
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Old 11-19-2008, 05:05 PM   #3 (permalink)
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While we are on the subject, is everyone using 5w-20? Is anyone running a different weight oil in their Hemi? I would assume Chrsyler would prefer 5w-20 to make the motor more efficient, am I wrong and why? Just been pondering that....
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Old 11-19-2008, 05:08 PM   #4 (permalink)
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5W-20 ensures that the MDS on the 5.7 functions properly. Also, a lighter grade oil will give a little better mileage.
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Old 11-19-2008, 05:26 PM   #5 (permalink)
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is regular gas like 87 good for my car??
sumetimes when i give it gas i here sum weird noise comming from the engine!
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Old 11-19-2008, 06:15 PM   #6 (permalink)
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Put 89 in your hemi, as the manual says..... high grade (93) for srt8's
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Old 11-19-2008, 06:59 PM   #7 (permalink)
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Quote:
Originally Posted by MdotCline View Post
While we are on the subject, is everyone using 5w-20? Is anyone running a different weight oil in their Hemi? I would assume Chrsyler would prefer 5w-20 to make the motor more efficient, am I wrong and why? Just been pondering that....
I've been using 0W30 synthetic for the past 30,000 miles (about 50,000 kms) and have absolutely no issues. MDS works fine. Mileage is about the same (or negligent increase....not enough to notice).

I changed over once my car hit 70,000 miles (105,000 kms).

Over in Europe, the manual for our cars calls for 5W30, since they can't really get the 5W20. I figured if a "30" weight oil is fine in Europe, it's fine here too, and it is.

BTW, 5W20 has become more and more popular due to car manufacturers striving to meet the stricter C.A.F.E. standards for their entire production. Infact, when Ford began recommending 5W20 in their cars, it was for the same car and engine that it had been recommending 5W30 for the previous model year. Same engine, same car, same specs....different weight oil. The only difference was that the year the new 5W20 became recommended was the year the stricter C.A.F.E. standards took effect.

5W20 will be ok if you don't plan on keeping your car past 100,000 miles (160,000 kms) which their research points to as being the majority of car owners. Past that point, they figure you won't care if the engine was been properly lubrciated/protected or not since you're getting rid of the car. If you're like me and plan on keeping it for a long long time, then switch to 5W30 synthetic (or 0W30 synthetic year round if you're in Canada like me) for the extra protection.
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Old 11-19-2008, 07:54 PM   #8 (permalink)
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I prefer the 89 octane over the 87 and my manual states that 89 is the better performing gas but 87 is okay. I can feel the difference under a hard pull. As far as oil goes, some of the suggestions are super. I would use a good grade of whatever you feel comfortable with. I change my oil overy 3k with 5w20 and my MDS works fine.
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Old 11-19-2008, 08:18 PM   #9 (permalink)
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Quote:
Originally Posted by MoparCanuck View Post
I've been using 0W30 synthetic for the past 30,000 miles (about 50,000 kms) and have absolutely no issues. MDS works fine. Mileage is about the same (or negligent increase....not enough to notice).
If the MDS works fine with 30 weight synthetic, this is good news. Seems that around here you can only get the 5W-20 in litre jugs and it is never on sale whereas the 5W-30 & 0W-30 is available in 4 litre jugs and is often on sale.
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Old 11-19-2008, 08:26 PM   #10 (permalink)
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Quote:
Originally Posted by robaustin View Post
If the MDS works fine with 30 weight synthetic, this is good news. Seems that around here you can only get the 5W-20 in litre jugs and it is never on sale whereas the 5W-30 & 0W-30 is available in 4 litre jugs and is often on sale.
I've been using it for about 1 1/2 years now and my route takes me from Quebec city to Sarnia every month, so I'm on the MDS all the time on the 401. It works fine for me as well as all the Europeans who have to put it (a 30 wieght oil) in as as well as there is hardly any 5w20 over there.

Also, a synthetic resists increasing it's viscocity (thickening up) with use/age. A dino oil will get thicker the dirtier it gets. Because a good synthetic already starts with a higher base number, it resists this for much longer. I wouldn't push it to 40,000 kms between oil changes, but I'm doing mine every 15,000 kms and always use premium synthetic 0W30.

BTW Rob....is it true you guys already had snow over there in London?

Last edited by MoparCanuck; 11-19-2008 at 08:29 PM.
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