# Full synthetic high milage oil **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [April 3, 2025, 4:09pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723 "2025-04-03T16:09:28Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Georgefocus2](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@Georgefocus2](https://community.cartalk.com/u/Georgefocus2)\ **Post date:** [April 3, 2025, 4:09pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/1 "2025-04-03T16:09:28Z")
I recently put full synthetic high milage in my used 09 ford focus with 134k miles and at first I noticed a better response and smooth driving. But the second day the car felt different. Heavy, like I have heavy load in my car. I was using motorcraft synthetic blend. Could this be that the additives and detergents are doing their job and i should do an oil change soon? The bottle smells like laundry detergent compared to the Motorcraft. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [April 3, 2025, 4:52pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/2 "2025-04-03T16:52:55Z")
Are you sure that you haven’t overfilled the crankcase? Just to be sure, I suggest that you pull the dipstick when the engine is cold. ---
**Author:** ![Georgefocus2](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@Georgefocus2](https://community.cartalk.com/u/Georgefocus2)\ **Post date:** [April 3, 2025, 4:56pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/3 "2025-04-03T16:56:38Z")
No overfilled. I checked the dipstick after putting the oil and this morning too, after runing the engine. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [April 3, 2025, 5:17pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/4 "2025-04-03T17:17:59Z")
Did ur old filter look like this? ![image](https://global.discourse-cdn.com/cartalk/original/3X/7/f/7f1c3a93c94f8028817d0fbc6ef1726378a371fc.jpeg) ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [April 3, 2025, 5:21pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/5 "2025-04-03T17:21:20Z")
> [@Georgefocus2](#): > > after runing the engine. You are supposed to check oil level before starting most vehicles . ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [April 3, 2025, 5:43pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/6 "2025-04-03T17:43:39Z")
I can think of no reason that oil of the correct grade, regardless of type, would have any effect on how the car responded. You may have some other problem. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [April 3, 2025, 6:04pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/7 "2025-04-03T18:04:53Z")
Might want to check for a dragging brake or a parking brake that did not fully release. Especially after sitting over night. Rainy or snowy or cold where you are? I only use Mobil though and know nothing about motorcraft. ---
**Author:** ![Georgefocus2](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@Georgefocus2](https://community.cartalk.com/u/Georgefocus2)\ **Post date:** [April 3, 2025, 9:09pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/8 "2025-04-03T21:09:07Z")
I thought it was the other way around. Let it warm up. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [April 3, 2025, 9:33pm UTC](https://community.cartalk.com/t/full-synthetic-high-milage-oil/199723/9 "2025-04-03T21:33:08Z")
The engine should be off for 15 minutes before checking the oil level. This is from the owner’s manual: ![image](https://global.discourse-cdn.com/cartalk/original/3X/e/0/e042d66229f228d603fb69747e5054d111beb9d3.png)