# Would you use Liqui Moly Pro-Line Engine Flush on a 13yr with 120k Mazda? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [April 19, 2026, 7:09pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531 "2026-04-19T19:09:36Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![sciconf](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@sciconf](https://community.cartalk.com/u/sciconf)\ **Post date:** [April 19, 2026, 7:09pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/1 "2026-04-19T19:09:36Z")
Mazda 5 - does 2x6k commute lately - previously all freeway miles. I use Mobil 1 and Wix filter - change yearly. Once sent it to lab after about 15months of use - Blackstone recommended extending the interval - but I am doing yearly, 4k. Since the last oil change, 1k, oil is relatively dark compared to Volt or 2017 Prius with 40k. So thinking of using it in my next oil change: - add the Flush and run for 20min on the existing oil - put some cheap engine oil (use the same filter?) and drain it again after 10min of idling - chnage filter and put Mobil 1 What do u guys think? Saw some old threads - older than my car though: [https://community.cartalk.com/t/is-engine-flushing-effective/756/9](https://community.cartalk.com/t/is-engine-flushing-effective/756/9) [https://community.cartalk.com/t/engine-oil-flush/17544/10](https://community.cartalk.com/t/engine-oil-flush/17544/10) ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [April 19, 2026, 7:32pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/2 "2026-04-19T19:32:06Z")
Simply unnecessary. ---
**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 19, 2026, 7:32pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/3 "2026-04-19T19:32:47Z")
Take of the valve cover. Top of head clean? No sludge? Flush is not needed. Or, remove oil fill cap and look inside. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [April 19, 2026, 7:59pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/4 "2026-04-19T19:59:33Z")
I would just add Sea Foam each oil change. > **[How To Add Sea Foam Motor Treatment To Crankcase Oil | Sea Foam](https://seafoamworks.com/help-center/how-to-add-sea-foam-motor-treatment-to-crankcase-oil/)** > > Sea Foam Motor Treatment can be used in every type of gasoline or diesel engine. When added to an engine’s oil crankcase, Sea Foam Motor Treatment works to Tester ---
**Author:** ![sciconf](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@sciconf](https://community.cartalk.com/u/sciconf)\ **Post date:** [April 19, 2026, 8:16pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/5 "2026-04-19T20:16:49Z")
Thanks @Tester {you saved me a few tires last time by giving me a link for my Prius!} So add **5 Oz of Seaform** **to the Crankcase** - car takes 5qts of oil? It seems I could also add it to gas tank, simultaneously - identical cans? Seaform seems simpler process than Liqui Moly (perhaps this is a bit heavy duty and needed for engines that is clogged up bad). ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 19, 2026, 10:42pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/6 "2026-04-19T22:42:34Z")
![dwym-blue-logo](https://global.discourse-cdn.com/cartalk/original/3X/5/b/5b47eb434daf45cc6d55e811de4f0e513755ab01.jpeg) ---
**Author:** ![auto-owner](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@auto-owner](https://community.cartalk.com/u/auto-owner)\ **Post date:** [April 20, 2026, 5:27am UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/8 "2026-04-20T05:27:34Z")
If you feel like making a donation to the Liqui Moly company then why not? ---
**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\ **Post date:** [April 20, 2026, 8:03am UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/9 "2026-04-20T08:03:02Z")
Mouse milk. ---
**Author:** ![sciconf](https://avatars.discourse-cdn.com/v4/letter/s/919ad9/32.png) [@sciconf](https://community.cartalk.com/u/sciconf)\ **Post date:** [April 25, 2026, 9:09pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/10 "2026-04-25T21:09:56Z")
My research shows that this is not light hearted effort. You could harm the engine as per the video below assuming the link is not biased: [https://youtu.be/64irVjjKdRY](https://youtu.be/64irVjjKdRY) ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [April 25, 2026, 10:20pm UTC](https://community.cartalk.com/t/would-you-use-liqui-moly-pro-line-engine-flush-on-a-13yr-with-120k-mazda/205531/11 "2026-04-25T22:20:39Z")
I’ve used Sea Foam for over fifty years and never had a problem. But, I always follow the directions on the can. > **[What Is Sea Foam And Should I Use It?](https://mechanicbase.com/reviews/what-is-seafoam-and-how-do-you-use-it/)** > > Find out what Sea Foam is, how it works, and if you should add it to your car maintenance routine to keep your vehicle running in top condition. Tester