CountryRock 199 #1 Posted August 25, 2019 I'm looking at oil for the hydro and I'm wondering if I can use the Mobil 1 10w-30 high mileage in it as I'm planning on putting it in the engine as well. Share this post Link to post Share on other sites
pfrederi 17,881 #2 Posted August 25, 2019 That is what I put in my 418A hydro unit a couple years ago. Seems to work OK 1 Share this post Link to post Share on other sites
WHX?? 49,167 #3 Posted August 25, 2019 I use the synthetic flavor in both the motor and hydro on my 520s with no problems 1 Share this post Link to post Share on other sites
oliver2-44 9,866 #4 Posted August 26, 2019 Just to be sure, if it had motor oil in it continue to use motor oil, if it had automatic transmission fluid (red) continue to use that. 1 Share this post Link to post Share on other sites
CountryRock 199 #5 Posted August 26, 2019 Got er done. Thanks for the input. Share this post Link to post Share on other sites
