louder engine w/ new oil?

[deadlast]

after i put in some new oil (valvoline synthetic) my engine is alot louder. the exhaust sounds the same, but before the oil, under the hood you could just hear the pullies spinning. now it has a very little hint of a diesel sound. no pinging or knocking, just more like a diesel engine. should i be worried?

 

[DMAN302]

No offence but likely it's all in your mind..I wouldn't worry about the oil situation as long as you dranined both plugs, pulled the filter, changed it, and added ONLY 5QTs max.

 

[bullitstang1313]

Have you been using synthetic oil for a while now? How many miles are on the engine? Like Dman said, it's probably just in your head, but it is good to be cautious.

 

[garystocker]

How many miles on the engine? If it's a high milage engine you are better off with regular 10W-40. The syn stuff is too thin and allows for less compression and leaks could also begin from your gaskets and seals if the engine is worn and used to thicker oil.

 

[garystocker]

and the noise is bearings, piston knock etc.

 

[deadlast]

i used 4 bottles of 10w30 and 1 10w 40 since they ran out. its got 102,xxx on it, and this is the the first oil change the car has had in my possesion. its def. not me hearing it, because my friend hears it too. ill keep a close watch

 

[HISSIN50]

Some synthetics, being thinner, allow one to hear more valvetrain noise (esp with PAO basestocks). But the protection provided from them is superior to a dino oil.

It can be disconcerting though. Do what makes you feel good.

Good luck.

 

[srothfuss]

I don't think that I would have mixed the weights of the oil... That could be a side issue itself. When you put oil in, you should use 5 quarts of 1 weight

 

[ECU5.0]

I don't think that I would have mixed the weights of the oil... That could be a side issue itself. When you put oil in, you should use 5 quarts of 1 weight

there is nothing wrong with mixing oil of different weights or brands for that matter. i ran for a few oil changes that consisted of 3 quarts of havoline 5w30 and 2 quarts of M1 15w50. the motor ran great. as far as the original post goes....try going to a higher weight synthetic oil than what was run it in before. a 10w30 synthetic usually acts like a 5w30 conventional oil from what ive read. so try going up a weight. check out www.auto-rx.com and www.bobistheoilguy.com ....both are very helpful sights.

 

[HISSIN50]

a 10w30 synthetic usually acts like a 5w30 conventional oil from what ive read.

I think I would have chosen to say that the synthetic has the ambient (and pour) properties of a thinner dino oil - that is a little more specific. Because the thinner synthetic will generally still outperform (in terms of how it is acting) a conventional dino (Gp II) dino oil.

I agree with ECU about using more viscous synthetic. The synthetic will have a lower pour point than a same weight dino oil (for example, M1 15W-50 pours down to ~ -40*F).

Or perhaps a HDEO might work well in this application too.

good luck.

 

[ECU5.0]

sorry, i wasnt very specific. it gets hard to straighten all my thoughts out after a few beers. i study bobistheoilguy, and try to help people out in my store (advance auto) when they are purchasing oil but most people just blow me off like im some kind of retard trying to sell them a certain type of oil when in fact the oil they want to buy is complete crap

 

[srothfuss]

I disagree that there isn't anything wrong with mixing weights of oils. Now when the motor is up to temperature, he will have 4 quarts of oil with a 30w viscosity and 1 quart with 40w viscosity. That one quart will move slower through the motor making the engine have to work harder to push that extra quart around. I still say stick to one constant weight

 

[ECU5.0]

how much harder is it for a oil pump to push that 10w40 up to the top of the engine than it is to push the 10w30? not much, plus if you do mix the oil with different weights it doesnt stay 4 quarts of 10w30 and 1 quart of 10w40 for more than maybe 4 seconds. mixing oil is a great way to get the viscosity and additives that work well in certain conditions. ive also run 4 qts of delo 400 (yes its diesel oil) and 1 quart of M1 5w30 with absolutely amazing results. i didnt burn a single drop of oil and i didnt leak a single drop of oil in 3k miles and i probably could have gone longer because the oil wasnt even that dirty when i drained it

 

[HISSIN50]

I am with ECU on the "home brews" (familiar term, eh?) In the old days, there were mixing issues, esp with the first synthetics and dino oils. These days, not so much.

I see no issues with the home brew idea, and do it myself all the time. With people doing VOA's, it really helps one to figure out how things might blend together.

And ECU, I agreed with you before - I was just trying to be more concise. Everyone knows I cant spit out what I mean, and I dont even drink.

 

[ECU5.0]

I am with ECU on the "home brews" (familiar term, eh?) In the old days, there were mixing issues, esp with the first synthetics and dino oils. These days, not so much.

I see no issues with the home brew idea, and do it myself all the time. With people doing VOA's, it really helps one to figure out how things might blend together.

And ECU, I agreed with you before - I was just trying to be more concise. Everyone knows I cant spit out what I mean, and I dont even drink.

its scary how much we think alike. you are just more exact on what you say, i just say what comes to me.

but i love the idea of mixing oils and finding out if different combinations work....ive probably changed my oil every two months since started lookin at bobistheoilguy