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Old 11-26-2013, 08:32 PM
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Cold Startup oil flow

I sometimes have to let my 2014 Limited 3.6 sit in the garage for a couple of days without starting it. The push button start is new to me and it bothers me a little that it starts so fast,like half a turn, and goes to a high idle; especially in the winter. I'm sure that everything is working properly, and it's engineered to run like that, but I almost wish that it would crank a little and get the oil pumped around and up to the top of the engine. I guess I'm showing my age. When cars had automatic chokes, in the winter I'd crank it a bit before setting the choke and letting it start. Any ideas, suggestions?
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Old 11-26-2013, 08:35 PM
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Re: Cold Startup oil flow

Press the button and let it do its thing.

I do wait until the rpms get down to 1,000 or less before moving. That's probably old fashioned also.


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Old 11-26-2013, 08:46 PM
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Originally Posted by bill_de View Post
Press the button and let it do its thing.

I do wait until the rpms get down to 1,000 or less before moving. That's probably old fashioned also.

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i always do the same
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Old 11-26-2013, 09:13 PM
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Same here. Let them drop below 1k before putting into gear. Remote start helps with this also.
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Old 11-26-2013, 09:44 PM
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Re: Cold Startup oil flow

At the next oil change, specify synthetic 0W-20 oil because it flows more easily at low temperatures and resists high temperatures better.
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Old 11-26-2013, 09:50 PM
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Re: Cold Startup oil flow

Thanks for the input. That helps. When I bought the Jeep they gave me 6 free oil changes. The deal is that the dealer uses a semi-synthetic oil unless I want to pay extra. I would ordinarily run a full synthetic and do it all myself. The dealer insisted that the semi was fine, but you're right that a lighter weight full synthetic would get up to the heads faster. I like the idea of the dealer doing the oil changes for warranty purposes. I thought that the 0-20 might be too light. It calls for 5-20 and doesn't mention 0-20 as an option. Have you run 0-20? Maybe next time I'll see how much extra they want or just buy my own syn oil when I bring it in. And what's with putting the oil filter upside down on top of the engine?? Could they get it any further from the oil pump? I've got to think that no matter what kind of a check valve there is, it drains down eventually.
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Old 11-26-2013, 10:30 PM
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Re: Cold Startup oil flow

Have you ever looked at the Oil pressure of a 3.6 when she starts? Mine in the winter with the standard 5w30 oil would hit 88PSI idle. the 3.6 oil pump is a BEAST. my 6.4 doesn't hit 88.
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Old 11-26-2013, 10:33 PM
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Re: Cold Startup oil flow

that's nice to know, makes me feel better, thanks
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Old 11-26-2013, 10:43 PM
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Re: Cold Startup oil flow

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Originally Posted by Stevm65 View Post
that's nice to know, makes me feel better, thanks
From http://pentastars.com/ FYI more info than you will ever need on the 3.6

Quote:
A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure.

A force balance mechanism inside the oil pump adjusts the size of the pumping chambers to alter oil flow. If the oil is cold, the pump reduces the size of the internal chambers. When the oil is hot and thinner, more oil is needed, and a spring increases the size of the pump chambers. This also saves energy.

The pump is driven at a 1:1 drive ratio; its location under the block is more efficient than an on-crankshaft location. An internal, mechanical ball-and-spring relief valve dumps oil into the sump when needed, for conditions such as a cold start with high engine speed. Both pump and pressure regulation solenoid are non-serviceable.
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Old 11-27-2013, 12:12 AM
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Re: Cold Startup oil flow

I usually start the Jeep (most of the time remote start) just before I let my dog back inside the house. Give him his treat, pet him and walk to the garage and get in the Jeep. By then, most of the time, it has idled down.

Other times, I start the Jeep and sit in it until it idles down to below 1000 rpm. Usually takes only about 30 secs.

I start driving and try to keep the rpms below 4k until it is all warmed up. I have been doing this on all my cars for years....

Cheers,
-A
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Old 11-27-2013, 02:05 PM
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Re: Cold Startup oil flow

I think what was bothering me the most was using the blended oil last time. Some information indicated that there could be as little as 10% synthetic in the blend. I originally thought that it was more like half. I do believe that the synthetic will move faster on cold starts and cling better on shutdown. Anyway,the dealer said that they would use any oil I wanted as long as it met specs, so this morning I bought some Pennzoil full Synthetic 5w-20 and they did the labor and filter per the service contract. I think that was the best overall solution for me.
Thanks for all the information from everyone
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Old 11-27-2013, 02:28 PM
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Re: Cold Startup oil flow

Quote:
Originally Posted by Stevm65 View Post
Thanks for the input. That helps. When I bought the Jeep they gave me 6 free oil changes. The deal is that the dealer uses a semi-synthetic oil unless I want to pay extra. I would ordinarily run a full synthetic and do it all myself. The dealer insisted that the semi was fine, but you're right that a lighter weight full synthetic would get up to the heads faster. I like the idea of the dealer doing the oil changes for warranty purposes. I thought that the 0-20 might be too light. It calls for 5-20 and doesn't mention 0-20 as an option. Have you run 0-20? Maybe next time I'll see how much extra they want or just buy my own syn oil when I bring it in. And what's with putting the oil filter upside down on top of the engine?? Could they get it any further from the oil pump? I've got to think that no matter what kind of a check valve there is, it drains down eventually.
I'd expect a decent oil to try to stick to "stuff" for a few days, but if you regularly leave it parked for longer periods and are nervous, look for a battery or externally powered oil circulator accessory.

I also get nervous about the high rpm it starts with even when its colder than $!$$@ outside. I suspect they may know something I don't, but it still makes me cringe.
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