Cheers for the reply fella.
After looking through the forum until about 4:30 this morning found out some things to tryout on the wind noise,as for the knocking I'll suggest this to my son as he works for Mercedes as a mechanic he can do the detective work as I know nothing about cars just the basics.
Not that I don't want to know,it's just a time issue and the unknown with me,as for the oil I did take it to a Subaru garage last year as the mechanic there told me that on the older cars they need oil that's a little bit thicker to hug the engin,so he suggested W10-40 MINERAL OIL.
So have been using this over the last year,it does seem to last longer and is thicker,but as I said in first talk Ihave to top up about every 3/4 weeks,and when I check the dip stick no oil is showing but the oil warning light has never came on over the time I have had the forester which is about a year and a half,happy to just keep filling oil up for now though until a answer is found.
I can get 2 gallon of mineral oil from GSF £25 so not to bad that lasts a few months.so it's notthe end of the world.
Must go now as Kidd have football and must finish off grouting tiles then put bathroom furnishings up then see what the boss has planed for me next as she likes to keep me busy,then shel says we never have time to ourselve,can't WIN.
Anyway enjoy weekend fella
Best regards
Anth